Tomita Research Group

Welcome

Tomita research group (photonic nanomaterials and nonlinear photonics group) has been exploring novel nanocomposite meterials for applications in photonics and neutron optics. Here we describe all about our research group and recent works. Enjoy!

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Recent News

12.05. 2018: Our collaborative work with Univ. Vienna (Austria) on neutron optics using nanoparticle-polymer composite gratings will be published in Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment (NIMA), A 916, 154-157 (2019).
12.04 2018: Prof. Tomita gave an oral presentation at Prof. Weiwen Zou's group, Department of Electronic Engineering, Shanghai Jiao Tong University (China).
12.01 2018: Prof. Tomita gave his invited talk at International Workshop on Holography and Related Technologies (IWH) 2018 (Suzhou, China)
05.10 2018: Our collaborative work with Univ. Alicante (Spain) on Nanoparticle-(thiol-ene) polymer composite gratings has been published in Polymers 10, 518 (2018).
05.10 2018: Prof. Tomita gave his oral talk at OPAL 2018 (Barcelona, Spain).>
04.25 2018: Prof. Tomita gave his oral talk at SPIE Photonics Europe (Strasbourg, France).>
01.25.2018: Prof. Tomita gave his oral talk at PHOTOPTICS 2018 (Madeira, Portugal).
01.24.2018: Prof. Tomita gave his invited talk at III International Symposium on Nanoparticles/Nanomaterials Applications (3rd ISN2A-2018) (Caprica, Lisbon, Portugal).
12.06.2017: Prof. Tomita gave his invited talk at EMN Orlando Meeting 2017 (Orlando, USA).
11.23.2017: Dr. J. Klepp (University of Vienna), our research collaborator, gave his oral talk at the 3rd international converence, nano FIS (Graz, Austria).
09.12.2017: Prof. Tomita gave his keynote talk at The 12th Japan-Finland Joint Symposium on Optics in Engineering (OIE'17) (Sado, Japan).
08.22.2017: Shun-suke Matsushima (grad. student) gave his poster presentation at The 24th Congress of the International Commission for Optics (ICO-24) (Tokyo, Japan).
07.20.2017: Prof. R. A. Rupp (University of Vienna, Austria), our research colloaborator, gave his invited presentation at Photorefractive Photonics 2017 (Qingdao, China).
07.18.2017: Prof. Tomita gave his invited presentation at Photorefractive Photonics 2017 (Qingdao, China).
07.17.2017: Our work on high-order optical nonlinearities in semiconductor CdSe quantum dots dispersed nanocomposite materials has been published in Journal of Physics: Conference Series 867, 012011 (2017).
06.26.2017: Prof. Tomita gave his presentation at CLEO-Euripe/EQEC 2017 (Munich, Germany).
04.26 2017: Prof. M. Fally (University of Vienna), our research colloaborator, gave his poster presentation at SPIE Optics+Optoelectronics 2017 (Prague, Czech).
04.25 2017: Prof. Tomita gave his invited presentation at SPIE Optics+Optoelectronics 2017 (Prague, Czech).
04.25 2017: Dr. J. Guo (Beijing University of Technology), our research collaborator, gave his presentation at SPIE Optics+Optoelectronics 2017 (Prague, Czech).
04.21 2017: Prof. Tomita gave an oral presentation at Prof. Martin Fally's group, Faculty of Physics, University of Vienna, Austria.
11.08.2016: Dr. X. Liu (Research Center of Laser Fusion, China), our research aollaborator, gave his poster presentation at the 4th International Symposium on Later Interaction with Matter (LIMIS).
10.28.2016: Prof. Tomita gave his keynote presentation at NICE OPTICS 2016 (Nice, France).
10.13.2016: Prof. Tomita gave his oral presentation at SPIE Photonics Asia 2016 (Beijing, China).
10.12.2016: Prof. Tomita gave an oral presentation at Prof. Xinping Zhang's group, Beijing University of Technology (BJUT), China.
10.12.2016: Our collaborative work with Univ. Vienna, Univ. of Salzburg, Institut Laue-Langevin, and Paul Scherrer Institut on neutron optics with nanocomposite gratings has been published in Journal of Physics: Conference Series 746, 012022 (2016).
09.28.2016: Dr. J. Klepp (Univ. Vienna), our research collaborator, gave his invited presentation at OPEG16.
09.26.2016 Prof. Tomita gave an oral presentation at Prof. John. T. Sheridan's group, National University of Ireland, University College Dublin (UCD).
09.23.2016 Prof. Tomita served as an external examiner for viva at National University of Ireland, University College Cork (UCC).
09.16.2016: Dr. J. Klepp (Univ. Vienna), our research collaborator, gave his poster presentation at NESY2016.
09.15.2016: Prof.M. Fally (Univ. Vienna), our research collaborator, gave his invited presentation at NESY2016.
09.15.2016 Mr. Roberto Fernandez (Univ. Alicante, Spain) joined our group.
09.15.2016 Prof. Tomita gave his oral presentation at Fall JSAP meeting (Niigata).
09.15.2016 Shinsuke Takeuchi gave his oral presentation at Fall JSAP meeting (Niigata).
07.28.2016: Our work on coaxial holographic digital data page recording in nanoparticle-(thiol-ene) polymer composites has been published in Japanese Journal of Applied Physics 55, 09SB03 (2016).
07.20.2016: Prof. Tomita gave his oral presentation at OSA Advanced Photonics (Vancouver, Canada).
05.12.2016: Prof. Tomita gave his invited presentation at EMS Meeting Droplets 2016 (San Sebastian, Spain).
04.13.2016 Our recent publication [Opt. Lett. 41, 1281 (2016)] has been chosen for inclusion in "Spotlight on Optics" (https://www.osapublishing.org/spotlight/summary.cfm?id=337277).
04.07.2016 Prof. Tomita gave his oral presentation at SPIE Photonics Europe 2016 (Brussels, Belgium).
03.21.2016 Takanori Ono (grad. student) gave his oral presentation at Spring JSAP meeting (Tokyo).
03.21.2016 Shinsuke Takeuchi gave his oral presentation at Spring JSAP meeting (Tokyo).
03.12.2016: Our work on volume holographic recording in organic nanoparticle-polymer composites has been published in Optics Letters 41, 1281 (2016).
03.10.2016: Our work on holographic polymer-dispersed liquid crystals has been published in Materials 9, 188-1 (2016).
02.22.2016: Our work on photopolymerizable nanocomposite photonic materials and their applications as an invited review article has been published in Journal of Modern Optics 63, S11 (2016).
12.02 2015: Prof. Tomita gave his oral presentation at IWH2015 (Okinawa, Japan).
12.02 2015: Shinsuke Takeuchi gave his poster presentation at IWH2015 (Okinawa, Japan).
11.04.2015: Prof. Tomita gave his invited presentation at ICSS Meeting 2015 (Phuket, Thailand).
10.30.2015 Jin-ichiro Takahashi (grad. student) gave his poster presentation at OPJ2015 (Tokyo).
10.10.2015: Our recent work on volume holographic recording in photopolymerizable nanoparticle-polymer composites doped with thiols acting as chain-transfer agents has been published in Optical Review vol.22, 832 (2015).
10.04.2015: Prof. Tomita gave his oral presentation at ISOM'15 (Toyama, Japan).
09.29.2015: Prof. Tomita gave his invited presentation at "Physics Today" seminar in the Physics Department, Nankai University (Tianjin, China).
09.29.2015: Prof. Tomita gave his invited presentation at Photonics Center, Nankai University (Tianjin, China).
09.02.2015: Prof. Tomita gave his invited presentation at OIE15 (Joensuu, Finland).
08.13.2015: Prof. Tomita gave his oral presentation at SPIE Optics + Photonics (San Diego, USA).
08.11.2015: SPIE Fellow award was conferred to Prof. Tomita at SPIE Optics + Photonics (San Diego, USA).
07.08.2015: Welcome! Miss Ying Liu (Prof. Xiaodi Tan's group, Beijing Institute of Technology) has visited us for her experiment until Aug. 4, 2015.
06.23.2015: Prof. Tomita gave his oral presentation at CLEO-Euripe/EQEC 2015 (Munich, Germany).
06.15.2015: Our recent work on a real-time optical method of photopolymerization shrinkage has been published in Optics Express vol.23, 15356 (2015).
04.25.2015: Prof. Tomita gave his invited presentation at 2015 EMN Optoelectronics Meeting (Beijing, China).
04.01.2015: JSPS Grants-in-Aid for Scientific Research (B) has been granted.
03.14.2015: Prof. Tomita took up a potision of one of associate editors for the Journal of the Optical Society of America B (JOSA B).
03.12.2015: Ryu-ichi Yamagami (grad. student) gave his oral presentation at Spring JSAP meeting (Kanagawa).
03.12.2015: Prof. Tomita gave his oral presentation at Spring JSAP meeting (Kanagawa).
02.04.2015: Our recent work on a new blue-sensitive nanocomposite material has been published in Journal of Applied Physics vol.117, 053105 (2015).
01.01.2015: Prof. Tomita has been elected to the grade of Fellow of SPIE.
10.07.2014: Ryu-ichi Yamagami, Takanori Ono and Jun-ichiro Takahashi (all grad. students) gave their oral presentations at OPJ2014 (Tokyo).
10.16.2014: Dr. Jinxin Guo (JSPS postdoc) gave his oral presentation at IWH2014 (Beijing, China).
10.16.2014: Prof. Tomita gave his invited presentation at IWH2014 (Beijing, China).
10.08.2014: Kohta Nagaya (grad. student) gave his oral presentation at the CPM workshop, IEICE (Tokyo).
09.18.2014: Dr. Jinxin Guo (JSPS postdoc) gave his oral presentation at Fall JSAP meeting (Sapporo).
09.17.2014: JSAP Fellow award was conferred to Prof. Tomita at JSAP award ceremony (Sapporo).
09.05.2014: Prof. Tomita gave his invited presentation at Univ. Alicante (Alicante, Spain).
08.29.2014: Prof. Tomita gave his invited presentation at ICO-2014(Santiago de Compostela, Spain).
06.25.2014:Prof. Tomita gave his invited presentation at CMMR2014(Incheon, South Korea).
06.11.2014: OSA Fellow award was conferred to Prof. Tomita at CLEO2014 (San Jose, USA).
04.17.2014: Prof. Tomita and Dr. Jinxin Guo (JSPS postdoc) gave their oral presentations at 2014 Photonics Europe (Brussels, Belgium).


Tomita Research Group | Last Modified: November 14, 2018


About

Introduction

Our research group belongs to the Department of Engineering Science in the Faculty of Informatics and Engineering, University of Electro-Communications. In quest for the realization of novel photonic devices and optical signal/information processing systems based on wave and quantum nature of light, we investigate various branches of photonics including functional photonic materials, holographic display technologies, nonlinear photonics, nanophotonics and organic photonics as well as neutron optics through experimental/theoretical studies and numerical simulations. For details refer to "Research Highlights" in the menu.
Prof. Yasuo Tomita, the principle investigator, organizes the research group that consists of postdoctral research associates an administrative secretary, and graduate/undergraduate students. We have also had research collaborations with other research institutions and private companies. Our research outcomes have been presented at domestic and international conferences and published in international journals such as OSA and APS journals. For details refer to "Publications" and "People" in the menu.

Research subjects
  • Photopolymerizalbe nanocomposite materials for photonic applications
  • Development of volume holographic nanocomposite gratings for wearable displays with functions of augmented/mixed reality (AR/MR)
  • Development of optical memory matericals using organic-inorganic nanocomposite materials for holographic digital data multiple storage
  • Nonlinear optical effects in semiconductor quantum dot-dispersed nanocomposite materials
  • Fabrication and characterization of nonlinear photonic crystals formed by holographic nanoparticle assembly
  • Phase transition dynamics in photopolymerizable nanocomposite materials
  • Polymer-dispersed liquid crystal devices for photonic control
  • Holographic neutron-optic devices
Downloadable/web accessible articles about our research
  • Recent Research Topic in UEC-e-Bulletin vol.13 in March 2017    
  • Invited Review Article on Our Recent Works [Journal of Modern Optics 63, S1-S31(2016)]    
  • SPIE Newsroom in July, 2007 (pdf, 413k)   
  • Materials Research Society (MRS) Bulletin in June, 2005 (pdf, 744k)   
  • The light fantastic," Nature in April, 2003 (pdf, 318k)   

    Group photo with alumni


Research Highlights

  • Holographic assembly of nanoparticles in photopolymerizable nanoparticle-polymer composites (NPCs)

    We have developed a new nano-assemblying method, the so-called "Holographic assembly of nanoparticles in polymer", that provides the all-optical control of mesoscopic distributions of nanoparticles and semiconductor quantum dots in the large volume of organic materials with single step and dry processes. It can be done in our newly developed photopolymerizable NPCs. This method is expected for its use not only in photonics, but also in neutron optics, materials science, electronics, biotechnology and printing technology.

    (a)A volume hologram recorded in an NPC by laser interference. (b) Morphorlogy of the hologram cross section observed by a transmission-electron microscope. (c) Atomic distributions of the hologram cross section observed by an electron-probe micro-analyzer, where Si stands for a distribution of silica nanoparticles and S stands for a polymer distribution, respectively.

  • Optical recording nanocomposite materials to holographic digital data storage

    We have developed novel holographic recording materials that simultaneously possess large refractive index changes, low polymerization shrinkage and high thermal stability. In order to realize such performance, we have employed the organic-inorganic NPC structure that consists of inorganic SiO2 nanoparticles dispersed in thiol-ene monomer capable of step-growth photopolymerizations. Figure (a) shown below is our optical setup for shift-multiplexed holographic digital data page recording with our thiol-ene based nanocomosite material. It can be seen that the NPC can store all 256 data pages with high diffraction efficiencies [Figure (b)] and low symbol-error rates (SERs) [Figure (c)]. Our new holographic nanocomposite materials can also be used for other applications such as holographic diffractive elements and 3D printers.

    (a) Optical setup for shift-multiplexed digital data page recording. A readout image of a digital data page with 9:16 symbol modulation coding is also shown. (b) Diffraction efficiencies and SERs of readout 256 data pages.

  • Nonlinear optics of semiconductor quantum dot dispersed nanocomposite materials and its application to nonlinear photonic crystals

    We have studied novel nonlinear optical nanocomposite materials doped with high concentrations (> 1 vol.%) of semiconductor quantum dots (QDs). These nanocomposite materials can also record photonic lattice structures by holographic assembly of QDs. Therefore, the nanocomposites can possess large optical nonlinearities owing to the quantum size effect of QDs and the electromagnetic feedback by the optically recordable photonic lattice structure. We expect their uses in nonlinear optical devices and photonic crystals. They may also be used for photonic crystal circuits and plasmonic devices.

    (a) Surface-modified CdSe QD. (b) Ionic exchange between ionic monomer and synthesized QDs in water, giving highly CdSe QD-dispersed monomer. (c) Self-diffracted beams due to the nonlinear multiwave interaction in a CdSe QD-dispersed nanocomposite film of ~ 50 micron thickness.

  • Holographic neutron-optic devices for cold and very cold neutron beam control and interferometry

    Neutron interferometers and non-destructive neutron imaging can find their uses in science and technology areas such as fundamental physics, polymer science, life science, medical applications and magnetic materials. The use of cold and very cold neutrons, long wavelength slow neutrons, is expecetd to use in these applications since such slow neutrons provide large neutron-optic refractive indices in matter, which enables the interferometric sensitivity higher than thermal neutrons. In recent years we have collaborated with Prof. Fally's neutron optics group at Univ. Vienna (Austria) and done several exciting and important results by use of our NPC volume gratings. These include a half-mirror, a highly diffractive mirror, a multi-beam splitter for slow neutrons. We expect the use of these hologprahic neutron-optic devices in slow-neutron interferometry.

    (a) Schematics of Bragg diffraction by an NPC volume grating. (b) Our experimental result showing the half-mirror operation for a cold neutron beam at a wavelength of 2 nm. (c) Free standing nanocomposite volume grating. (d) Our experimental result showing the mirror operation by use of a free standing nanocomposite volume grating for a very cold neutron beam at a wavelength of 3.76 nm. Schematics of (e) Mach-Zhender and (f) Zernike interferometers for slow neutrons with NPC volume gratings.


Publications

Peer reviewed articles
  • M. Blaickner, B. Demirel, I. Drevensek-Olenik, M. Fally, P. Flauger, P. Geltenbort, Y. Hasegawa, R. Kurinjimala, M. Licen, C. Pruner, S. Sponar, Y. Tomita, J. Klepp, "Monte-Carlo simulation of neutron transmission through nanocomposite materials for neutron-optics applications," Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment A916, 154-157 (2019).
  • R. Fernandez, S. Gallego, Y. Tomita, I. Pascual, and A. Belendez, "Diffractive and interferometric characterization of nanostructured photopolymer for sharp diffractive optical elements recording," Polymers 10, 518-1-518-11 (2018).
  • Y. Tomita, S. Matsushima, R. Yamagami, T. Jinzenji, S. Sakuma, X. Liu, T. Izuishi, and Q. Shen, "High-order optical nonlinearities in nanocomposite films dispersed with semiconductor quantum dots at high concentrations," Journal of Physics: Conference Series 867, 012011 (2017).
  • J. Klepp, C. Pruner, Y. Tomita, P. Geltenbort, J. Kohlbrecht, and M. Fally, "Advancing data analysis for reflectivity measurements of holographic nanocomposite gratings," Journal of Physics: Conference Series 746, 012022 (2016).
  • K. Nagaya, E. Hata, and Y. Tomita, "Readout fidelity of coaxial holographic digital data page recording in nanoparticle-(thiol-ene) polymer composites," Japanese Journal of Applied Physics 55, 09SB03-1 - 09SB03-4 (2016).
  • Y. Tomita, H. Urano, T. Fukamizu, Y. Kametani, N. Nishimura, and K. Odoi, "Nanoparticle-polymer composite volume holographic gratings dispersed with ultrahigh-refractive-index hyperbranched polymer as organic nanoparticles," Optics Letters 41, 1281-1284 (2016), which has been chosen for inclusion in "Spotlight on Optics" (https://www.osapublishing.org/spotlight/summary.cfm?id=337277).
  • Y. Fukuda and Y. Tomita, "Spatial frequency responses of anisotropic refractive index gratings formed in holographic polymer dispersed liquid crystals," Materials 9, 180-1-180-16 (2016); doi:10.3390/ma9030188.
  • Y. Tomita, E. Hata, K. Momose, S. Takayama, X. Liu, K. Chikama, J. Klepp, C. Pruner, and M. Fally, "Photopolymerizable nanocomposite photonic materials and their holographic applications in light and neutron optics," (an invited topical review article), Journal of Modern Optics 63, S1-S31(2016); doi: 10.1080/09500340.2016.1143534.
  • M. Kawana, J. Takahashi, J. Guo, and Y. Tomita, "Measurement of polymerization-shrinkage evolution during curing in photopolymer with a white-light Fabry-Pérot interferometer," Optics Express 23, 15356-15364 (2015).
  • J. Guo, R. Fujii, and Y. Tomita, "Volume holographic recording in nanoparticle-polymer composite doped with multifunctional chain transfer agents," Optical Review 22, 832-836 (2015).
  • M. Kawana, J. Takahashi, S. Yasui, and Y. Tomita, "Characterization of volume holographic recording in photopolymerizable nanoparticle-(thiol-ene) polymer composites at 404 nm," Journal of Applied Physics 117, 053105-1 - 053105-6 (2015).
  • J. Guo, R. Fujii, T. Ono, J. Klepp, C. Pruner, M. Fally, and Y. Tomita, "Effects of chain-transferring thiol functionalities on the performance of nanoparticle-polymer composite volume gratings," Optics Letters 39, 6743-6746 (2014).
  • R. Fujii, J. Guo, J. Klepp, C. Pruner, M. Fally, and Y. Tomita, "Nanoparticle-polymer-composite volume gratings incorporating chain-transfer agents for holography and slow-neutron optics," Optics Letters 39, 3453-3456 (2014).
  • M. Miki, R. Ohira, and Y. Tomita, "Optical properties of electrically tunable two-dimensional photonic lattice structures formed in a holographic polymer-dispersed liquid crystal film: Analysis and experiment," Materials 7, 3677-3698 (2014).
  • K. Mitsube, Y. Nishimura, K. Nagaya, S. Takayama, and Y. Tomita, "Holographic nanoparticle-polymer composites based on radical-mediated thiol-yne photopolymerizations: Characterization and shift-multiplexed holographic digital data page storage," Optical Materials Express 4, 982-996 (2014).
  • S. Takayama, K. Nagaya, K. Momose, and Y. Tomita, "Effects of symbol modulation coding on readout fidelity of shift-multiplexed holographic digital data page storage in a photopolymerizable nanoparticle-(thiol-ene)polymer composite film," Applied Optics 53, B53-B59 (2014).
  • J. Klepp, M. Fally, P. Geltenbort, C. Pruner, and Y. Tomita, "Slow-neutron mirrors from holographic nanoparticle-polymer composites," Laue-Langevin Institute Annual report 2013, 86-87 (2014).
  • M. Prijatelj, J. Klepp, Y. Tomita, and M. Fally, "Far-off-Bragg reconstruction of volume holographic gratings: A comparison of experiment and theories, " Phys. Rev. A 87, 063810-1 - 063810-8 (2013).
  • J Klepp, M Fally, P Geltenbort, C Pruner, and Y Tomita, "Angle amplification effect in holographic gratings," Laue-Langevin Institute Experimental report, 3-14-309 (2013).
  • J. Klepp, C. Pruner, Y. Tomita, P. Geltenbort, I. Drevensek-Olenik, S. Gyergyek, J. Kohlbrecher, and M. Fally, "Holographic gratings for slow-neutron optics," Materials 5, 2788-2815 (2012).
  • J. Klepp, Y. Tomita, C. Pruner, J. Kohlbrecher, and M. Fally, "Three-port beam splitter for cold neutrons using holographic nanoparticle-polymer composite diffraction gratings," Applied Physics Letters 101, 154104-1-3 (2012).
  • X. Liu and Y. Tomita, "Closed-aperture Z-scan analysis for nonlinear media with saturable absorption and simultaneous third- and fifth-order nonlinear refraction," Physics Research International 2012, 1-9 (2012). Articl ID 161572. doi:10.1155/2012/161572.
  • M. Fally, J. Klepp, and Y. Tomita, "An experimental study on the validity of diffraction theories for off-Bragg replay of volume holographic gratings," Applied Physics B 108, 89-96 (2012).
  • K. Momose, S. Takamaya, E. Hata, and Y. Tomita, "Shift-multiplexed holographic digital data page storage in a nanoparticle-(thiol-ene) polymer composite film," Optics Letters 37, 2250-2252 (2012).
  • X. Liu, Y. Adachi, Y. Tomita, J. Oshima, T. Nakashima, and T. Kawai, "High-order nonlinear optical response of a polymer nanocomposite film incorporating semiconducotor CdSe quantum dots," Optics Express 20, 13457-13469 (2012).
  • J. Klepp, C. Pruner, Y. Tomita, K. Mitsube, P. Geltenbort, and M. Fally, "Mirrors for slow neutrons from holographic nanoparticle-polymer free-standing film-gratings," Applied Physics Letters 100, 214104-1-3 (2012), which was also in the June 4, 2012 issue of the Virtual Journal of Nanoscale Science & Technology 25, issue 23 (2012).
  • J Klepp, M Fally, P Geltenbort, C Pruner, and Y Tomita, "Holographic absorption gratings recorded in CdSe nanoparticle-polymer composites for neutron-optics," Laue-Langevin Institute Experimental report, 1-20-25 (2012).
  • E. Hata and Y. Tomita, "Stoichiometric thiol-to-ene ratio dependences of refractive index modulation and shrinkage of volume gratings recorded in photopolymerizable nanoparticle-polymer composites based on step-growth polymerization," Optical Materials Express 1, 1113-1120 (2011).
  • J. Klepp, C. Pruner, Y. Tomita, C. Plonka-Spehr, S. Ivanov, P. Geltenbort, J. Kohlbrecher, M. A. Ellabban, and M. Fally, "Neutron diffraction by holographic gratings recorded in SiO2 nanoparticle-polymer composites," Physical Review A84, 013621-1-7 (2011).
  • E. Hata, K. Mitsube, K. Momose, and Y. Tomita, "Holographic nanoparticle-polymer composites based on step-growth thiol-ene photopolymerization," Optical Materials Express 1, 207-222 (2011).
  • J. Klepp, C. Pruner, M. A. Ellabban, Y. Tomita, H. Lemmel, H. Rauch, and M. Fally, "Neutron-optical gratings from nanoparticle-polymer composites," Nuclear Instruments and Methods in Physics Research A 634, S59-S62 (2011).
  • Y. Tomita, "Holographic nanoparticle-photopolymer composites," Encyclopedia of Nanoscience and Nanotechnology, H. S. Nalwa ed.,Volume 15, pp.191-205 (American Scientific Publishers, Valencia, 2011).
  • M Fally, M. A. Ellabban, Y. Tomita, T. Nakamura, J. Klepp, C. Pruner, R. A. Rupp, M. Bichler, I. D. Olenik, J. Xu, H. Eckerlebe, H. Lemmel, and H. Rauch, "Neutron optical beam splitter from holographically structured nanoparticle-polymer composites," Physical Review Letters 105. 123904-1-9123904-4 (2010). which was selected as an Editor's Selection in this issue.
  • X. Liu, K. Matsumura, Y. Tomita, K. Yasui, K. Kojima, and K. Chikama, "Nonlinear optical responses of nanoparticle-polymer composites incorporating organic (hyperbranched polymer)-metallic nanoparticle complex," Journal of Applied Physics 108, 073102-1- 073102-9 (2010), which was also in the November 22, 2010 issue of the Virtual Journal of Ultrafast Science 9, issue 11 (2010).
  • E. Hata and Y. Tomita, "Order-of-magnitude polymerization-shrinkage suppression of volume gratings recorded in nanoparticle-polymer composites," Optics Letters 35, 396-398 (2010), which was also cited in the March 1, 2010 issue of the Virtual Journal of Nanoscale Science & Technology 21, issue 9 (2010).
  • K. Omura and Y. Tomita, "Photopolymerization kinetics and volume holographic recording in ZrO2 nanoparticle-polymer composites at 404 nm," Journal of Applied Physics 107, 023107-1-023107-6 (2010), which was also cited in the February 8, 2010 issue of the Virtual Journal of Nanoscale Science & Technology 21, issue 6 (2010).
  • X. Liu, Y. Tomita, J. Oshima, K. Chikama, K. Matsubara, T. Nakashima, and T. Kawai, "Holographic assembly of semiconductor CdSe quantum dots in polymer for volume Bragg grating structures with diffraction efficiency near 100%," Applied Physics Letters 95, 261109-1-261109-3 (2009).
  • L. Ren and Y.Tomita, "Transient and nonlinear analysis of slow-light pulse propagation in an optical fiber via stimulated Brillouin scattering," Journal of the Optical Society of America B26, 1281-1288 (2009). <
  • T. Nakamura, J. Nozaki, Y. Tomita, K. Ohmori and M. Hidaka, "Holographic recording sensitivity enhancement of ZrO2 nanoparticle-polymer composites by hydrogen donor and acceptor agents," (invited paper), Journal of Optics A: Pure and Applied Optics 11, 024010-1 -024010-7 (2009).
  • Y Tomita, T. Nakamura, and A. Tago, "Improved thermal stability of volume holograms recorded in nanoparticle-polymer composite films,"Optics Letters 33, 1750-1752 (2008), which was also in the September 8, 2008 issue of the Virtual Journal of Nanoscale Science & Technology 18, issue 11 (2008).
  • K. Chikama, K. Mastubara, S. Oyama, and Y. Tomita, "Three-dimensional confocal Raman imaging of volume holograms formed in ZrO2 nanoparticle-photopolymer composite materials," Journal of Applied Physics 103, 113108-1 -113108-6 (2008).
  • S. Wang, L. Ren, Y. Liu, and Y. Tomita,"Zero-broadening SBS slow light propagation in an optical fiber using two broadband pump beams," Optics Express 16, 8067-8076 (2008).
  • L. Ren and Y. Tomita, "Reducing GVD-dependent broadening of SBS slow light in an optical fiber by use of a single pump laser," Journal of the Optical Society of America B25, 741-746 (2008).
  • N. Suzuki and Y. Tomita, "Holographic scattering in SiO2 nanoparticle-dispersed photopolymer films," Applied Optics 46, 6809-6814 (2007).
  • Y. Tomita, "Holographic assembly of nanoparticles in photopolymers for photonic applications," SPIE Newsroom, Micro/Nano Lithography & Fabrication, January, 2007, DOI: 10.1117/2.1200612.0475, http://newsroom.spie.org/x5249.xml?highlight=x525.
  • H. Qiao, J. Xu, Y. Tomita, D. Zhu, B. Fu, G. Zhang, and G. Zhang, "UV-light-induced one-color and two-color photorefractive effects in congruent and near-stoichiometric LiNbO3:Mg crystals," Optical Materials 29, 889-895 (2007).
  • N. Suzuki, Y. Tomita, K. Ohmori, M. Hidaka, and K. Chikama, "Highly transparent ZrO2 nanoparticle-dispersed acrylate photopolymers for volume holographic recording," Optics Express 14, 12712-12719 (2006).
  • H. Qiao and Y. Tomita, "Ultraviolet-light-induced absorption changes in highly Zn-doped LiNbO3, " Optics Express 14, 5773-5778 (2006), which was also in the Ausust, 2006 issue of the Virtual Journal of Ultrafast Science 5, issue 8 (2006).
  • Y. Tomita, K. Chikama, Nohara, N. Suzuki, K. Furushima, and Y. Endoh, "Two-dimensional imaging of atomic distribution morphology created by holographically induced mass transfer of monomer molecules and nanoparticles in a silica-nanoparticle-dispersed photopolymer film," Optics Letters 31, 1402-1404 (2006).
  • H. Takahashi, T. Naitoh and Y. Tomita, "Holographic recording in methacrylate photopolymer film codoped with benzyl n-butyl phthalate and silica nanoparticles," Japanese Journal of Applied Physics 45, 5023-5026 (2006).
  • Y. Tomita, K. Furushima, K. Ochi, K. Ishizu, A. Tanaka, M. Ozawa, M. Hidaka, and K. Chikama, "Organic nanoparticle (hyperbranched polymer)-dispersed photopolymers for volume holographic storage," Applied Physics Letters.88, 071103-1- 071103-3 (2006), which was also in the February 27, 2006 issue of the Virtual Journal of Nanoscale Science & Technology 13, issue 8 (2006).
  • N. Suzuki and Y. Tomita, "Real-time phase-shift measurement during formation of a volume holographic grating in nanoparticle-dispersed photopolymers," Applied Physics Letters vol.88, 011105 (2006).
  • H. Qiao, Y. Tomita, J. Xu, Q. Wu, G. Zhang and G. Zhang, "Observation of strong stimulated photorefractive scattering and self-pumped phase conjugation in LiNbO3:Mg in the ultraviolet," Optics Express 13, 7666-7671 (2005).
  • H. Takahashi, J. Yamauchi, and Y. Tomita, "Characterization of silica-nanoparticle-dispersed photopolymer films that include Poly(methyl methacrylate) as host binder material," Japanese Journal of Applied Physics 44, L1008-L1010 (2005).
  • Y. Tomita, N. Suzuki, and K. Chikama, "Holographic manipulation of nanoparrticle-distribution morphology in nanoparticle-dispersed photopolymers," Optics Letters vol.30, 839-841 (2005).
  • W. Zou, R. Matsushima, Y. Tomita, and G. Zhang, "Ultraviolet-light sensitization of near-infrared photorefractivity in Mg-doped stoichiometric LiNbO3 for nonvolatile one-color holography," Japanese Journal of Applied Physics vol.43, 7491-7494 (2004).
  • Y. Tomita, S. Sunarno and G.Zhang, "UV-light-gating two-color photorefractive effect in near-stoichiometric Mg-doped LiNbO3," Journal of the Optical Society of America B 21, 753-760 (2004).
  • N. Suzuki and Y. Tomita, "Silica nanoparticles-dispersed methacrylate photopolymer with net diffraction efficiency near 100%," Applied Optics 43, 2125-2129 (2004).
  • N. Suzuki and Y. Tomita, "Diffraction properties of volume holograms recorded in SiO2 nanoparticle-dispersed methacrylate photopolymer films," Japanese Journal of Applied Physics 42, L927-L929 (2003).
  • Y. Tomita and H. Nishibiraki, "Improvement of holographic recording sensitivities in the green in SiO2 nanoparticle-dispersed methacrylate photopolymer films doped with pyrromethene dyes," Applied Physics Letters 83, 410-412 (2003).
  • G. Zhang and Y.Tomita, "Ultraviolet-light-induced near-infrared photorefractivity and two-color holography in highly Mg-doped LiNbO3," Journal of Applied Physics 93, 9456-9459 (2003).
  • S. Sunarno, Y. Tomita, and G. Zhang, "Light-induced absorption changes in In-doped lithium niobate," Applied Physics Letters 81, 4505-4507 (2002).
  • N. Suzuki and Y. Tomita, "Holographic recording in TiO2 nanoparticle-dispersed methacrylate photopolymer films," Applied Physics Letters 81, 4121-4123 (2002), which has also been listed in the December 2, 2002 issue of the Virtual Journal of Nanoscale Science & Technology vol.6, issue 23 (2002).
  • T. Kojima and Y. Tomita, "Characterization of index and surface-relief gratings in methacrylate photopolymers," Optical Review 9, 222-226 (2002).
  • G. Zhang, Y. Tomita, X. Zhang and J. Xu, "Near-infrared holographic recording with quasi- nonvolatile readout in LiNbO3:In,Fe," Applied Phsics Letters 81, 1393-1395 (2002).
  • G. Zhang and Y. Tomita, "Broadband absorption changes and sensitization of near-infrared photorefractivity induced by ultraviolet light in LiNbO3:Mg," Journal of Applied Physics 91, 4177-4180 (2002).
  • Y. Tomita, M. Hoshi, and S.Sunarno, "Nonvolatile two-color holographic recording in Er-doped LiNbO3," Japanese Journal of Applied Physics vol.40, pp.L1035-L1037 (2001).
  • G. Zhang, S. Sunarno, M. Hoshi, Y. Tomita, C. Yang, and W. Xu, "Characterization of two-color holography performance in reduced LiNbO3:In," Applied Optics 40, 5248-5252 (2001).
  • G. Zhang, Y. Tomita, W. Xu, and C. Yang, "Nonvolatile two-color holography in indium-doped lithium niobate," Applied Physics Letters 7, 3508-3510 (2000).
  • Y. Tomita and R. Kuze, "Apodization effect of a reflection photorefractive hologram with linear absorption," Opt.Commun. vol.183, pp.327-331 (2000).
  • Y.Tomita, "Self-enhanced diffraction properties of a nominally undoped barium titanate crystal with a thermally fixed grating," (invited paper) Optical and Quantum Electronics vol.32, pp.349-365 (2000).
  • Y. Tomita, "On the nonphotoactive ionic species for thermal fixing of volume holograms in undoped barium titanate," Japanese Journal of Applied Physics 38, L440-L442 (1999).
  • N. Nakajima and Y. Tomita, "A new approach to determine the intensity and phase of ultrashort pulses by use of time-to-space conversion and a noniterative phase- retrieval algorithm," Journal of the Optical Society of America A 16, 1268-1276 (1999).
  • Y. Tomita and S. Matsushima, "Photorefractive beam coupling between orthogonally polarized light beams by linear dichroism in Cu-doped potassium sodium strontium barium niobate," Journal of the Optical Society of America B, 16, 111-116 (1999).
  • F. Nishida, N. Kushibiki, and Y. Tomita, "Faster grating buildup characteristics in low silanol-containing polysilane-based photorefractive polymer," Applied Physics Letters 73, 2565-2567 (1998).
  • Y. Tomita and S. Matsushima, "Two-wave mixing and hologram recording by using linear dichroism in Cu-doped potassium sodium strontium barium niobate," Journal of Optoelectronics.Laser 9, Supp. 424-426 (1998).
  • Y. Tomita and S. Matsushima, "Origin of temperature-dependent diffraction efficiency in self-enhanced readout from thermally fixed gratings in photorefractive barium titanate," Journal of the Optical Society of America B, 14, 2877-2884 (1997).
  • K. Kusakabe and Y. Tomita, "Temperature-dependent picosecond two-beam coupling gains in undoped GaAs and Ga-doped CdTe," J. of Appl. Phys. 82, 5077-5081 (1997).
  • K. Kusakabe and Y. Tomita, "Effect of hot electron nonlinear transport on picosecond space-charge field dynamics in semi-insulating GaAs," Jpn. J. Appl. Phys. 36, 6360-6367 (1997).
  • F. Nishida and Y. Tomita, "Polarization anisotropies in the electric field dependent diffraction efficiency in azo dye doped photoconducting electro-optic polymer PVK:TNF:DR1:ECz," J. of Appl. Phys. 81, 3348-3353 (1997).
  • T. Inoue and Y. Tomita, "Light-induced director axis reorientation in a dye-doped ferroelectric liquid crystal and its application to self-aligned spatial filtering," J.Opt.Soc.Am. B, 13, 1916-1920 (1996).
  • J.Widjaja and Y.Tomita, "Particle image velocimetry using wavelet-matched filters," J. Mod. Opt., 43, 1993-1997 (1996).
  • J. Widjaja, Y. Tomita, and A.Wahab, "Application of wavelet-matched filters to holographic associative memories," Opt. Commun. 132, 217-220 (1996).
  • S. Matsushima and Y. Tomita, "Experimental investigation of the relationship between photorefractive and two-beam coupling response times," Opt. Commun. 128, 287-291 (1996).
  • H. Ishii and Y. Tomita, "Dynamics of space-charge fields created in photorefractive barium titanate by single picosecond pulses: a computer simulation," Opt. Commun. 126, 95-102 (1996).
  • J. Widjaja and Y. Tomita, "Optical wavelet-matched filtering by four-wave mixing in photorefractive media," Opt. Commun. 117, 123-126 (1995).
  • J. Widjaja and Y. Tomita, "Optical triple-in digital logic using nonlinear optical four-wave mixing," Appl. Opt. 34, 5074-5076 (1995).
  • Y. Tomita and E. Enami, "Picosecond cross-polarization beam coupling in semi-insulating Ga-doped CdTe at high fluences," Appl. Phys. Lett. 66, 914-916 (1995).
  • Y. Tomita, "Temperature dependence of photorefractive properties of Cr-doped potassium sodium strontium barium niobate," Opt. Materials 4, 281-285 (1995).
  • Y. Tomita and A. Suzuki, "Broadband photorefractivity of Cr-doped strontium barium niobate in the visible and near-infrared spectral regions," Opt. Rev. 1, 233-236 (1994).
  • Y. Tomita and A. Suzuki, "Photorefractive properties of Cr-doped strontium-barium niobate at 514.5 nm and 632.8 nm: A comparative study," Appl. Phys. A59, 579-582 (1994).
  • Y. Tomita and H. Ishii, "Dynamics of photoexcited carriers and space-charge field by tow-beam excitation in photorefractive semiconductors," Jpn. J. Appl. Phys. 33, 1892-1898 (1994).
  • Y. Tomita and J. Bergquist, "Photorefractive and thermooptic nonlinearities in potassium sodium strontium barium niobate single crystal," Optoelectronics -Devices and Technologies- 8, 357-377 (1993).
  • Y. Tomita, J. Bergquist, and M. Shibata, "Photorefractive properties of undoped, Cr-doped and Cu-doped KNSBN crystals," JOSA B10, 94-99(1993).
  • Y. Tomita, M. Shibata, and J. Bergquist, "Effects of free-carrier absorption on time-resolved pump-probe two-photon absorption in semi-insulating semiconductors," J. Appl. Phys. 72, 1075-1079 (1992).
  • J. Bergquist, Y. Tomita, and M. Shibata, "Near-infrared photorefractivity in Cr-doped potassium sodium strontium barium niobate single crystal," Appl. Phys. A55, .61-64 (1992).
  • Y. Tomita, M. Shibata, and J. Bergquist, "Pulsewidth dependence of time-resolved two-photon absorption with picosecond pump-probe excitation," J. Appl. Phys. 71, 2101-2105 (1992).
  • M. Shibata, Y. Tomita, and J. Bergquist, "Time-resolved nonlinear absorption in semi-insulating semi-conductors under picosecond two-beam excitation," Optics 21, 620-628 (1992), in Japanese.
  • Y. Tomita, R. Yahalom, and A. Yariv, " Phase shift and cross talk of a self-pumped phase-conjugate mirror," Optics Communications 73, 413-418 (1989).
  • Y. Tomita, R. Yahalom, K. Kyuma, A. Yariv, and N. S.-K. Kwong, " Polarization and spatial information recovery by modal dispersal and phase conjugation: properties and applications," (invited paper) IEEE Journal of Quantum Electronics QE-25, 315-338 (1989).
  • N. S.-K. Kwong, Y. Tomita, and A. Yariv, " Optical tracking filter using transient energy coupling," Journal of the Optical Society of America B 5, 1788-1791 (1988).
  • Y. Tomita, R. Yahalom, and A. Yariv, " Theory of polarization and spatial information recovery by modal dispersal and phase conjugation," Journal of the Optical Society of America B 5, 690-700 (1988).
  • Y. Tomita, R. Yahalom, and A. Yariv, " Real-time image subtraction with the use of wave polarization and phase conjugation," Applied Physics Letters 52, 425-427 (1988).
  • Y. Tomita, K. Kyuma, R. Yahalom, and A. Yariv, " Demonstration of amplitude-distortion correction by modal dispersal and phase conjugation," Optics Letters 12, 1020-1022 (1987).
  • Y. Tomita, R. Yahalom, and A. Yariv, " Fidelity of polarization and spatial information recovery using a fiber-coupled phase-conjugate mirror," Optics Letters 12, 1017-1019 (1987).
  • A. Yariv, Y. Tomita, and K. Kyuma, " Theoretical model for modal dispersal of polarization information and its recovery by phase conjugation," Optics Letters 11, 809-811 (1986).
  • Y. Tomita and T. Yoshino, " Optimum design of multilayer-medium structures in a magneto-optical readout system," Journal of the Optical Society of America A 1, 809-817 (1984).
  • Y. Tomita, K. Nakagawa, and T. Asakura, " The contrast variation of polychromatic speckle patterns of the far-field diffraction plane," Canadian Journal of Physics 58, 1439-1445 (1980).
  • Y. Tomita, K. Nakagawa, and T. Asakura, " Contrast of polychromatic speckle patterns with non-gaussian statistics," Optik 57, 209-216 (1980).
  • Y. Tomita, K. Nakagawa, and T. Asakura, " Fibrous radial structure of speckle patterns in polychromatic light," Applied Optics 19, 3211-3218 (1980).
International conference presentations
  • Y. Tomita, T. Aoi, Y. Iso, K. Satoh, J. Oshima, and K. Odoi, "Volume holographic nanocomposite gratings with very large refractive index modulation amplitudes," (invited talk), International Workshop on Holography and Related Technologies (IWH) 2018, November 30 - December 02, 2018, Suzhou, China, pp.25-26, December 01 (2018).
  • Y. Tomita, A. Kageyama, T. Aoi, Y. Iso, K. Umemoto, J. Klepp, C. Pruner, and M. Fally, "Photopolymerizable nanocomposite gratings for holographic control of slow neutron beams," OPAL 2018, May 9-11, 2018, Barcelona, Spain, (141), May 10 (2018); Technical Digiest of OPAL 2018, pp. 276 - 279 (2018).
  • Y. Tomita, T. Nakamura, A. F. Rizky, and R. Fujii "Spatial frequency response of nanocomposite holographic gratings," SPIE Photonics Europe, April 22-26, 2018, Strasbourg, France, 10679-27, April 25 (2018).
  • Y. Tomita, K. Nagaya, T. Aoi, Y. Iso, A. Kageyama, N. Nishimura, K. Odoi, K. Umemoto, J. Klepp, C. Pruner, and M. Fally, "Photopolymerizable nanoparticle-polymer vomposite materials for light and neutron beam manipulations," Special Session in Advanced Optical Materials, Sensors, and Devices (AOMatSens 2018), PHOTOPTICS 2018, January 25-27, 2018, Madeira, Portugal, Proceedings, pp. 313-322, January 25 (2018).
  • Y. Tomita, "Photopolymerizable nanocomposite materials for holographic applications," (invited talk), III International Symposium on Nanoparticles/Nanomaterials Applications (3rd ISN2A-2018), January 22-25, 2018, Caprica, Lisbon, Portugal, Proceedings Book O 24B, p.p. 162-163, January 24 (2018).
  • Y. Tomita, "Photopolymerizable nanocomposite materials for light beam control and processing," (invited talk), EMN Orlando Meeting 2017, December 4-8, Orlando, USA, A21, pp.36-37, December 6 (2017).
  • J. Klepp, I. Drevensek-Olenik, M. A. Ellabban, M. Fally, P. Flauger, P. Geltenbort, G. Glavan, M. Licen, C. Pruner, and Y. Tomita, "Application of nanomaterials for cold-neutron optics," The 3rd International Conference on Functional Integrated nano Systems (nano FIS), November 22-24, 2017, Graz, Austria.
  • Y. Tomita, E. Hata, T. Nakamura, K. Momose, X. Liu, S. Matsushima, J. Klepp, C. Pruner, and M. Fally, "Nanocomposite holographic gratings for light and neutron optics," (keynote talk), The 12th Japan-Finland Joint Symposium on Optics in Engineering (OIE'17), September 11-15, Sado, Japan, S1, September 12 (2017).
  • S. Matsushima and Y. Tomita, "Theory of closed-aperture Z-scan for nonlinear media with saturable absorption and simultaneous third- and fifth-order nonlinear refraction," The 24th Congress of the International Commission for Optics (ICO-24), August 21-25, Tokyo, Japan, P7-06 August 22 (2017).
  • R. A. Rupp, M. Fally, J. Klepp, C. Pruner, Y. Tomita, and I. D. Olenik, "Perspectives for photorefractive materials in neutron physics," (invited talk), Photorefractive Photonics 2017, July 17-20, Qingdao, China, July 20 (2017).
  • Y. Tomita, S. Matsushima, R. Yamagami, T. Jinzenji, S. Sakuma, X. Liu, T. Izuishi, and Q. Shen, "High-order optical nonlinearities in nanocomposite films dispersed with semiconductor quantum dots at high concentrations," (invited talk), Photorefractive Photonics 2017, July 17-20, Qingdao, China, 012011, July 18 (2017).
  • Y. Tomita, R. Yamagami, T. Jinzenji, S. Sakuma, T. Izuishi, and Q. Shen, "Femtosecond dynamics of optical nonlinearities in nanocomposite films highly dispersed with semiconductor CdSe quantum dots," Conference on Lasers and Electro-Optics Europe and 14th European Quantum Electronics Conference 2017 (CLEO/Europe-EQEC 2017), June 25-29, 2017, Munich, Germany, CE-P.18 MON, June 26 (2017).
  • J. Klepp, C. Pruner, Y. Tomita, P. W. Geltenbort, and M. Fally, "Observation of neutron Pendullösung-interference in holographic nanostructures," SPIE Optics + Optoelectronics, April 24-27, Prague, Czech Republic, 10233-63, April 26 (2017).
  • J. Guo, Y. Tomita, and X. Zhang, "Thermal effects of the functionalities of chain transfer agent on photopolymer holographic volume gratings," SPIE Optics + Optoelectronics, April 24-27, Prague, Czech Republic, 10233-11, April 25 (2017), Proc. SPIE 10233, 102330D1-6 (2017).
  • Y. Tomita, S. Oyaizu, N. Nishimura, and K. Odoi, "Nanocomposite volume holographic gratings incorporated with ultrahigh refractive index hyperbranched polymer for diffractive optical elements," (invited talk), SPIE Optics + Optoelectronics, April 24-27, Prague, Czech Republic, 10233-8, April 25 (2017), Proc. SPIE 10233, 102330A1-8 (2017).
  • X. Liu and Y. Tomita, "Nanocomposite materials incorporating metallic nanoparticles/semiconductor quantum dots and their applications in nonlinear optics," The 4th International Symposium on Later Interaction with Matter (LIMIS), November 6-9, 2016, Chengdu, China, S5-P06, November 8 (2016).
  • Y. Tomita, E. Hata, K. Momose, X. Liu, J. Klepp, C. Pruner, and M. Fally, "Photopolymerizable nanocomposite materials for light and neutron optics," (keynote talk), NICE OPTICS 2016, October 26-28, 2016, Nice, France, p.86 , October 28, (2016).
  • Y. Tomita, O. Satoko, S. Takeuchi, H. Urano, T. Fukamizu, N. Nishimura, and K. Odoi, "Hyperbranched-polymer dispersed nanocomposite volume gratings for holography and diffractive optics," SPIE Photonics Asia 2016, October 12-14, 2016, Beijing, China, paper 10022-24, October 13 (2016); Proc. SPIE 10022, 100220P-1-100220P-9 (2016).
  • J. Klepp, C. Pruner, Y. Tomita, P. Geltenbort, and M. Fally, "Observation of multi-wavelength neutron Pendullösung interference in holographic nanostructures," (invited talk), 66th yearly meeting of the Austrian Physical Society (OEPG16), September 26-29, 2016, Vienna, Austria, 14:15-14:45. September 28 (2016).
  • J. Klepp, C. Pruner, Y. Tomita, P. Geltenbort, and M. Fally, "Observation of neutron Pendullösung interference in holographic nanostructures," 2016 Meeting of Austrian Neutron and Synchrotron Users (NESY), September 15-16, 2016, Graz, Austria, September 16 (2016).
  • M. Fally, J. Klepp, C. Pruner, P. Geltenbort, G. Nagy, L. Coga, M. Licen, I. Drevensek-Olenik, and Y. Tomita, "Diffractive optics for slow neutrons," (invited talk), 2016 Meeting of Austrian Neutron and Synchrotron Users (NESY), September 15-16, 2016, Graz, Austria, September 15 (2016).
  • Y. Tomita, R. Yamagami, T. Jinzenji, T. Izuishi, and Q. Shen, "Nonlinear optical responses of photopolymerizable nanocomposites dispersed with CdSe quantum dots at high concentrations," OSA Advanced Photonics, July 18-20, 2016, Vancouver, Canada, NoW2D.4, pp.1-2, July 20 (2016).
  • Y. Tomita, "Effects of liquid crystal droplets on the spatial frequency response of a holographic polymer-dispersed liquid crystal grating," (invited talk), EMN Meeting Droplets 2016, May 9-13, 2016, San Sebastian, Spain, pp. 75-76, May 12 (2016).
  • J. Takahashi, M. Kawana, and Y. Tomita, "Blue-sensitized nanoparticle-(thiol-ene) polymer composites for volume holographic recording," SPIE Photonics Europe, April 4-7, 2016, Brussels, Belgium, 9889-42, April 7 (2016); Proc. SPIE 9889, 988913-1-988913-8 (2016).
  • Y. Tomita, "On the optical measurement of polymerization shrinkage: Interferometric method vs. holographic method," International Workshop on Holography and Related Technologies (IWH2015), December 01 - 03, 2015, Okinawa, Japan, We4-3, 1-2, December 02 (2015).
  • S. Takeuchi, Y. Liu, N. Nishimura, T. Ono, J. Takahashi, K. Odoi, X. Tan, and Y. Tomita, "Volume holographic recording in photopolymerizable nanocomposites incorporating ultrahigh refractive index hyperbranched polymer," International Workshop on Holography and Related Technologies (IWH2015), December 01 - 03, 2015, Okinawa, Japan, We5-P5, 1-2, December 02 (2015).
  • Y. Tomita, "Holographic control of nanoparticle-distribution morphology in polymer and its applications," (invited talk), ICSS Meeting 2015, November 4-7, 2015, Phuket, Thailand, pp. 40-41, November 4 (2015).
  • Y. Tomita and K. Nagaya, "Nanoparticle-concentration and thiol-ene stoichiometry dependences of readout fidelity in a coaxial holographic digital data storage system using a photopolymerizable nanoparticle-(thiol-ene) polymer composite film," International Symposium on Optical Memory 2015 (ISOM'15), October 4-8, 2015, Toyama, Japan, Technical Digest, Mo-E-03, 34-35, October 4 (2015).
  • J. Klepp, C. Pruner, Y. Tomita, P. Geltenbort, and M. Fally, "Observation of multi-energy neutron matter-wave Pendellösung interference in holographic nanostructures," 6th European Conference on Neutron Scattering (ECNS2015), August 30-September 4, 2015, Zaragoza, Spain, ID: PS-3-47, September 3 (2015).
  • Y. Tomita, "High-order nonlinear optical responses of nanostructured polymer composites doped with semiconductor CdSe quantum dots at high concentration," (invited talk), The Eleventh Japan-Finland Joint Symposium on Optics in Engineering (OIE'15), September 2-4, 2015, Joensuu, Finland, pp.100-101, September 2 (2015).
  • Y. Tomita, H. Urano, T. Fukamizu, and Y. Kametani, "Photopolymerizable polymer nanocomposites incorporated with hyperbranched polymer having ultrahigh index of refraction for holographic light manipulation," SPIE Optics + Photonics 2015, August 9-13, 2015, San Diego, USA, paper 9564-27, August 13 (2015); Proc. SPIE 9564, 95640S-1-95640S-7 (2015).
  • Y. Tomita, R. Yamagami, and T. Jinzenji, "Fabrication and nonlinear optical characterization of highly CdSe quantum dot dispersed polymer nanocomposites," Conference on Lasers and Electro-Optics Europe and 13th European Quantum Electronics Conference 2015 (CLEO/Europe-EQEC 2015), June 21-25, 2015, Munich, Germany, CE-8.5 TUE, June 23 (2015).
  • Y. Tomita, "Photopolymerizable polymer nanocomposite materials for photonic applications," (invited talk), 2015 EMN Optoelectronics Meeting, April 24-27, 2015, Beijing, China, B07, 59-60, April 25 (2015).
  • J. Guo, R. Fujii, T. Ono, and Y. Tomita, "On the role of multifunctional chain transfer agents in recording nanoparticle-polymer composites holographic gratings," International Workshop on Holography and Related Technologies (IWH2014), October 15 - 17, 2014, Beijing, China,16a06, 56-57, October 16 (2014).
  • Y. Tomita, "Holographic recording and beam control with organic-inorganic nanocomposites," (invited talk), International Workshop on Holography and Related Technologies (IWH2014), October 15 - 17, 2014, Beijing, China, 15b03, 24-25, October 15 (2014).
  • R.A. Rupp, M. Fally, J. Klepp, C. Pruner, Y. Tomita, and I. Drevensek, "Neutron physics in photorefractive materials: From researches to applications," (plenary talk), International scientific conference "Optics of Crystals" (OC-14), September 23-26, 2014, Mozyr, Belarus, September 23 (2014).
  • Y. Tomita, "Photopolymerizable organic-inorganic nanocomposite materials and their applications," (invited talk), The 23rd Congress of the International Commission for Optics (ICO), Santiago de Compostela, Spain, August 26-29 (2014).
  • Y. Tomita, "Light-induced nanoparticle assembly in photopolymer for holographic applications," (invited talk), Collaborative Conference on 3D & Materials Research (CC3DMR) 2014, June 23 - 27, 2014, Seoul, South Korea (2014).
  • M. Kawana, J. Takahashi, S. Yasui, and Y. Tomita, "Characterization of photopolymerizable nanoparticle-(thiol-ene) polymer composites for volume holographic recording at 404 nm," SPIE Photonics Europe, April 14-17, 2014, Brussels, Belgium, 9131-44 (2014).
  • J. Guo, R. Fujii, and Y. Tomita, "Spatial frequency response of a volume hologram recorded in a ZrO2 nanoparticle-dispersed acrylate photopolymer film containing chain transfer agents," SPIE Photonics Europe, April 14-17, 2014, Brussels, Belgium, 9131-43 (2014).
  • M. Fally, J. Klepp, C. Pruner, and Y. Tomita, "Optics with neutrons using holographic gratings," (invited talk), DPG (German Physical Society) Spring Meeting of the Condensed Matter Section (Dresden 14), Dresden, Germany, GER37, DF01, March 31 (2014).
  • Y. Tomita, "Photopolymerizable nanocomposite materials and their applications," (invited talk), The 11th International Conference "Correlation Optics" (CO'13), September 19, 2013, Chernivtsi, Ukraine, Session 3, 3-2 (2013).
  • Y. Tomita, "A new holographic recording material with high refractive index modulation and high mechanical/thermal stability: Photopolymerizable nanoparticle-polymer composite," (invited talk), International Symposium on Optical Memory 2013 (ISOM'13), August 19, 2013, Incheon, South Korea, Technical Digest, Mo-C-01, 16-17 (2013).
  • J. Klepp, Y. Tomita, C. Pruner, P. Geltenbort, and M. Fally, "Holographic gratings for long-wavelengths neutron optics," International Conference on Neutron Scattering (ICNS) 2013, July 8-12, 2013, Edinburgh, United Kingdom, oral talk, Neutron Optics PS15-5 July 10, (2013).
  • Y. Tomita, "Photopolymerizable nanocomposite materials for photonic applications,"(invited talk), Collaborative Conference on 3D & Materials Research (CC3DMR) 2013, June 26, 2013, Jeju, South Korea, 448-449 (2013).
  • Y. Adachi, R. Yamagami, Y. Tomita, T. Nakashima, and T. Kawai, "Effects of surface/deep traps on third- and high-order optical nonlinearities in photopolymerizable semiconductor CdSe quantum dot-polymer nanocomposites," Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference 2013 (CLEO/Europe-IQEC 2013), May 12-16, 2013, Munich, Germany, CE2.5, May 13, 2013.
  • K. Mitsube, Y. Nishimura, S. Takayama, K. Nagaya, and Y. Tomita, "Volume holographic recording in photopolymerizable nanocomposite materials based on radical-mediated thiol-yne step-growth polymerizations," SPIE Optics + Optoelectronics, April 15-18, Prague, Czech Republic, 8776-21 (2013); Proc. SPIE 8776, 87760I-1 - 87760I-12 (2013).
  • Y. Tomita, X. Liu, and Y. Adachi, "Gaussian beam Z-scan analysis for nonlinear optical materials possessing simultaneous third- and fifth-order nonlinear refraction with saturable absorption: an application to semiconductor CdSe quantum dot-polymer nanocomposites," SPIE Optical Systems Design, November, 2012, Barcelona, Spain, 8550-140 (2012): Proc. SPIE 8550, 85503G-1-85503G-11 (2012).
  • Y. Tomita, Y. Adachi, X. Liu, J. Oshima, T. Nakashima, and T. Kawai, "Nonlinear optical responses of photopolymerizable nanocomposites capable of holographically patterning photonic lattice structures," Technical Diegest of IEEE Photonics Conference 2012, September, 2012, San Francisco, USA, ThL4, 790-791 (2012).
  • Y. Fukuda and Y. Tomita, "Computer simulation of Bragg grating formation in holographic polymer-dispersed liquid crystals based on the density functional theory," SPIE Photonics Europe, April, 2012, Brussels, Belgium, 8429-45 (2012); Proc. SPIE 8429, 842919-1-842919-15 (2012).
  • Y. Tomita, K. Momose, E. Hata, and S. Takayama, "Characterization of holographic digital data page recording in nanoparticle-polymer composite films based on thol-ene photopolymerization," SPIE Photonics Europe, April, 2012, Brussels, Belgium, 8429-44 (2012);Proc. SPIE 8429, 842918-1- 842918-7 (2012).
  • L. Ren, J. Liang, M. Yun, C. Ma, X. Han, Y. Liu, and Y. Tomita, "Slow-light in photonic crystal waveguides/fiber: dispersion tailoring schemes for obtaining a high group index with wide band and low GVD," (invited talk) SPIE Photonics West, January 23, 2012, San Jose, USA, 8273-20 (2012); Proc. SPIE 8273, 82730L-1-82730L-12 (2012).
  • M. Fally, J. Klepp, C. Pruner, Y. Tomita, S. Gyergyek, I. Drevensek-Olenik, J. Kohlbrecher, and P. Geltenbort, "Polymer nanocomposite diffraction gratings for neutrons," (invited talk), SLONANO 2011, October 26-28, 2011, Ljubljana, Slovenia.
  • W. Schranz,J. Klepp, C. Pruner, M. Fally, Y. Tomita, I.Drevensek-Olenik, and S. Gyergyek, "Application of holographic gratings recorded in nanoparticle-polymer composites as cold-neutron diffractive elements," 8th Liquid Matter Conference, September 6-10, 2011, Vienna, Austria, P4.50, September 9, 2011.
  • J. Klepp, M. Fally, C. Pruner, Y. Tomita, I. Drevensek-Olenik, and S. Gyergyek, "Neutron-diffraction by holographic gratings recorded in nanoparticle-polymer composites," Joint Annual Meeting of the Swiss Physical Society with Swiss and Austrian Societies for Astronomy and Astrophysics, June 15-17, 2011, Lausanne, Switzerland, ID 390, p.94, June 17, 2011.
  • Y. Tomita, X. Liu, Y. Adachi, and J. Oshima, "Observation of higher-order optical nonlinearities in photopolymerizable semiconductor CdSe quantum dot-polymer nanocomposites," 2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference, May 22-26, 2011, Munich, Germany, CE2.5, May 25, 2011.
  • M. Fally, J. Klepp, C. Pruner, Y. Tomita, H. Eckerlebe, J. Kohlbrecher, and R.A. Rupp, "Holographic gratings for cold neutrons optics," (invited talk), An ICO international conference on Information Photonics 2011, May 18-20, 2011, Ottawa, Canada, HMDA-20-1-1, May 20, 2011.
  • Y. Tomita, E. Hata, K. Mitsube, and Y. Nishimura, "Stoichiometric thiol-ene ratio dependence of refractive index modulation and polymerization shrinkage in holographic nanocomposite materials," An ICO international conference on Information Photonics 2011, May 18-20, 2011, Ottawa, Canada, HMDA-20-1-5, May 20, 2011.
  • Y. Tomita, E. Hata, S. Yasui, and K. Mitsube, "Photopolymerizable thiol-ene nanocomposite materials for holographic applications," SPIE Optics + Optoelectronics, April 18-21, Prague, Czech Republic, 8074-14 (2011); Proc. SPIE 8074, 80740F-1-80740F-10 (2011).
  • J. Klepp, M. Fally, C. Pruner, Y. Tomita, I. Drevensek Olenik, and S. Gyergyek, "Neutron-diffraction by holographic gratings recorded in nanoparticle-polymer composites," 5th European Conference on Neutron Scattering, July 17-22, Prague, Czech, (2010).
  • M. Fally, J. Klepp, C. Pruner, M. Bichler, I. Drevensek Olenik, Y. Tomita, J. Kohlbrecher, and H. Eckerlebe, "Polymer-composites and polymers as beam splitters for neutrons," To be presented at the 10th Austrian Polymer Meeting and 2nd Joint Austrian-Slovenian Polymer Meeting 2010, September 8-10, Leoben, Austria, (2010).
  • X. Liu, Y. Tomita, J. Oshima, K. Chikama, T. Nakashima, and T. Kawai, "1D Photonic Lattice Structures Fabricated by Holographic Assembly of Semiconductor Quantum Dots in Photopolymer films," Proceedings of the 15th Optoelectronics and Communications Conference (OECC 2010), July, 2010, Sapporo, Hokkaido, Japan, 7E2-4 (2010).
  • X. Liu, Y. Tomita, J. Oshima, K. Chikama, T. Nakashima, and T. Kawai, "Holographic patterning of Semiconductor quantum dots in polymer for constructing photonic lattice structures," Technical Digest of the 2010 Conference on Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference (CLEO/QELS 2010), May, 2010, San Jose, California, U.S.A., CThL2 (2010).
  • X. Liu, Y. Tomita, K Yasui, K. Kojima, and K. Chikama, "Z-scan characterization of nonlinear optical effects in polymer films incorporating hyperbranched polymer-metallic nanoparticle complex," SPIE Photonics Europe, April, 2010, Brussels, Belgium, 7722-83 (2010);Proc. SPIE 7722, 77222A-1- 77222A-11 (2010).
  • Y. Tomita, E. Hata, K. Omura, and S. Yasui, "Low polymerization-shrinkage nanoparticle-polymer composite films based on thiol-ene photopolymerization for holographic data storage," SPIE Photonics Europe, April, 2010, Brussels, Belgium, 7722-82 (2010);Proc. SPIE 7722, 772229-1- 772229-7 (2010).
  • J. Klepp, M Fally, M. A. Ellabban, Y. Tomita, T. Nakamura, C. Pruner, R. A. Rupp, M. Bichler, I. D. Olenik, J. Xu, H. Eckerlebe, H. Lemmel, and H. Rauch, "Neutron-optical devices from nanoparticle-polymer composites," Proc. of International Workshop on Neutron Optics (NOP2010), March 17-19, 2010, Alpe d'Huez, France.
  • R. Ohira, M. Miki, and Y. Tomita, "Electrical tuning of two-dimensional honeycomb photonic lattices using holographic polymer-dispersed liquid crystals," SPIE Photonics West, January 27, 2010, San Franscisco, USA, 7618-38 (2010)); Proc. SPIE 7618, 761813-1 - 761813-10 (2010).
  • L. Ren, Y. Yang, W. Zhao, and Y. Tomita, "Spatial and temporal evolution of transient stimulated-Brillouin-scattering slow-light pulse in an optical fiber," SPIE Photonics West, January 25, 2009, San Franscisco, USA, 7612-06 (2010); Proc. SPIE 7612, 761207-1 - 761207-8 (2010).
  • J. Klepp, C.Pruner, M.Fritzenwanker, H.Rauch, T. Nakamura, Y. Tomita and M.Fally, "Holographically prepared diffraction grating for neutron interferometry," Joint Annual Meeting of the Austrian Physical Society, the Swiss Physical Society and the Austrian Society for Astronomy and Astro-Physics, September, 2009, Innsbruck, Austria, 167 (2009).
  • Y. Tomita, "Holographic nanoparticle-polymer composites for photonics and neutron optics," (invited talk), Technical Digest of The sixth Japan-Finland Joint Symposium on Optics in Engineering (OIE'09), September, 2009, Tokyo, Tokyo, Japan, 87-88 (2009).
  • X. Liu, Y. Tomita, K. Yasui, and K. Kojima, "Nonlinear optical properties of hyperbranched polymer-metallic nanoparticle complex in a polymer film and organic solution," Technical Digest of The sixth Japan-Finland Joint Symposium on Optics in Engineering (OIE'09), September, 2009, Tokyo, Tokyo, Japan, 145-146 (2009).
  • J. Klepp, C.Pruner, M.Fritzenwanker, H.Rauch, T. Nakamura, Y. Tomita and M.Fally, "Holographically prepared diffraction grating for neutron interferometry," Joint Annual Meeting of the Austrian Physical Society, the Swiss Physical Society and the Austrian Society for Astronomy and Astro-Physics, September, 2009, Innsbruck, Austria, 167 (2009).
  • S. Koda, E. Hata and Y. Tomita, "Characterization of hologram multiplexing in nanoparticle-polymer composites," SPIE Optics & Photonics 2009 Symposium, August, 2009, San Diego, California, U.S.A., 7402-31 (2009).
  • K. Omura, K. Gotoh, Y. Tomita, K. Ohmori and M. Hidaka, "Blue-sensitive nanoparticle-polymer composites for volume holographic recording," SPIE Optics & Photonics 2009 Symposium, August, 2009, San Diego, California, U.S.A., 7402-33 (2009); Proc. SPIE 7402, 7402X-1-7402X-8 (2009).
  • E. Hata, S. Koda, K. Gotoh, and Y. Tomita, "Volume holographic recording in nanoparticle-polymer composites with reduced polymerization shrinkage," Technical Digest of CLEO-Europe, June, 2009, CC2.2-THU, Munich, Germany, (2009).
  • M. Fally, M.A. Ellabban, I.D. Olenik, Y. Tomita, T. Nakamura, M. Bichler, R.A. Rupp, and H. Eckerlebe, "Holographically prepared diffraction gratings in nanoparticle dispersed polymers for neutron optics," Proceedings of the 12th Topical Meeting on Photorefractive Effects, Materials, and Devices-Control of Light and Matter (PR09), June, 2009, Bad Honnef, Germany, 200-201 (2009).
  • Y. Tomita, "Photonic nanocomposite media for holographic data storage," (invited talk) Technical Digest of IEEE/LEOS Optical Data Storage 2009 (ODS 2009), 10-13 May 2009, Lake Buena Vista, Florida, USA, paper WB1, 82-83 (2009).
  • L. Ren and Y. Tomita, "SBS-based slow light in optical fibers: optimum design considerations for undistorted slow-light signal propagation in small and large signal regimes," (invited talk) SPIE Photonics West, January 25, 2009, San Jose, USA, 7226-7 (2009); Proc. SPIE 7226 722605 (2009).
  • T. Nakamura, S. Koda, K. Ohmura, and Y. Tomita, "ZrO2 nanoparticle-polymer composite media for volume holographic recording," Technical Digest of the Joint International Symposium on Optical Memory and IEEE/LEOS Optical Data Storage 2008 (ISOM/ODS 2008), July, 2008, Hawaii, paper ODS01-62, 56-58 (2008).
  • Y. Tomita, T. Nakamura, and A. Tago, "On the thermal stability of volume holograms recorded in nanoparticle-polymer composite films," SPIE International Symposium on Photonics Europe, April, 2008, Strasbourg, France, 6994-30 (2008); Proc. SPIE 6994, 6994 0R1-0R7 (2008)..
  • L. Ren and Y. Tomita, "Distortion management of SBS slow light in a single-mode optical fiber by optimization of broadband SBS gain spectrum," SPIE International Symposium on Photonics Europe, April, 2008, Strasbourg, France, 6994-17 (2008); Proc. SPIE 6994, 0G1-0G10 (2008).
  • Y. Tomita, N. Suzuki, Y. Endoh, S. Kurozumi, M. Miki, and K. Chikama, "Holographic assembly of nanoparticles in polymers for 3D recording and patterning," (invited talk) SPIE Optics & Photonics 2007 Symposium, August, 2007, San Diego, California, U.S.A. (2007): Proc. SPIE 6657, 665702-1 - 6657027 (2007).
  • Y. Tomita, "Nanoparticle-photopolymer composites for holographic applications," (invited talk) Technical Digest of CLEO-Europe, June, 2007, CC1-1-THU, Munich, Germany, (2007).
  • H. Iioka, W Weng, A. Yamahata, and Y. Tomita, "Temperature-dependent anisotropic grating formation in a holographic polymer-disperesd liquid crystal," Technical Digest of CLEO-Europe, June, 2007, CC-11-WED, Munich, Germany, (2007).
  • N. Suzuki, Y. Tomita, K. Ohmori, M. Hidaka, and K. Chikama, "Characterization of volume gratings formed in ZrO2 nanoparticle-dispersed photopolymers," Technical Digest of CLEO-Europe, June, 2007, CC-20-WED, Munich, Germany, (2007).
  • N. Suzuki, Y. Tomita, K. Ohmori, M. Hidaka and K. Chikama, "Diffraction properties of holographic recording in zirconia nanoparticle-dispersed photopolymer films," Technical Digest of 12the Microoptics Conference (MOC'06), September, 2006, Seoul, Korea, 116 (2006).
  • Y. Endoh, K. Furushima and Y. Tomita, "A phenomenological mutual diffusion model for holographic grating formation in nanoparticle-dispersed photopolymers," Technical Digest of 12th Microoptics Conference (MOC'06), September, 2006, Seoul, Korea, 114 (2006).
  • Y. Tomita, Y. Endoh, K. Furushima, N. Suzuki and J. Nozaki, "Nanoparticle-dispersed photopolymers for holographic applications," to be presented at International Commission for Optics (ICO) Topical Meeting on Optoinformatics/Information Photonics '2006, September, 2006, St. Petersburg, Russia, 80 (2006).
  • K. Chikama,, Y. Nohara, S. Oyama, Y. Endoh, N. Suzuki, K. Furushima and Y. Tomita, "Electron-probe micro-analysis of a volume hologram recorded in a nanoparticle-dispersed photopolymer film," Proceedings of the 16th International Microscopy Congress, September, 2006, Sapporo, Japan, 1954 (2006).
  • Y. Tomita, Y. Endoh, K. Furushima and J. Nozaki, "Nanocomposite photopolymers doped with nanoparticles for volume holographic recording," (invited talk), Technical Digest of SPIE International Conference on Application of Photonic Technology (Photonics North 2006), June, 2006, Quebec, Canada, OM-06-2-2, 147 (2006); Proc. SPIE 6343, 634331-1-634331-8 (2006).
  • H. Takahashi, T. Naitoh and Y. Tomiat, "Effect of silica-nanoparticle dispersion on holographic recording in methacrylate-based photopolymer films," Proceedings of Materials Research Society (MRS) 2006 Spring Meeting, Symposium O, Hybrid Organic/Inorganic/Metallic Electronic and Optical Devices, April 17-21, 2006, San Francisco, California, U.S.A., (2006); Mater. Res. Soc. Symp. Proc. 939E, 0939-O06-01 (2006).
  • Y. Tomita, K. Furushima and Y. Endoh, M. Hidaka, K, Ohmori and K. Chikama, "Volume holographic recording in multi-component photopolymers with hyperbranched polymers as organic nanoparticles," (invited talk), SPIE International Symposium on Photonics Europe, April, 2006, Strasbourg, France, 6187-02 (2006); Proc. SPIE 6187, 618702-1-618702-10 (2006).
  • Y. Tomita, N.Suzuki and K. Furushima, "Holographic control of nanoparticle-distribution morphology in photopolymers for volume holographic recording and nonlinear optics," (invited talk), Technical Digiest of The sixth Japan-Finland Joint Symposium on Optics in Engineering (OIE'05), September, 2005, Sapporo, Hokkaido, Japan, 23-24 (2005).
  • Y. Tomita, N. Suzuki, K. Furushima and Y. Endoh, "Volume holographic recording based on mass transport of nanoparticles doped in methacrylate photopolymers," SPIE Optics & Photonics 2005 Symposium, August, 2005, San Diego, California, U.S.A., 5939-10 (2005); Proc. SPIE 5939, 593909-1-593909-9 (2005).
  • Y. Tomita, "Holographic manipulation of nanoparticle-distribution morphology in photopolymers and its applications to volume holographic recording and nonlinear photonic crystals," (invited talk), Proceedings of the Tenth International Conference on Photorefractive Effects, Materials, and Devices (PR05), July, 2005, Sanya, Hainan, China, TOPS 99, 274-280 (2005).
  • H. Qiao, J. Xu, G. Zhang, D. Zhu, W. Li, X. Yu, G.Zhang, X. Yu and Y. Tomita, "On the dark-decay behaviors of photorefractive gratings in magnesium doped near-stoichiometric lithium niobate crystals at 351 nm," Proceedings of the Tenth International Conference on Photorefractive Effects, Materials, and Devices (PR05), July, 2005, Sanya, Hainan, China, TOPS 99, 91-95 (2005).
  • H. Qiao, J. Xu, Q. Wu, X.Yu, G. Zhang and Y. Tomita, "Ultraviolet-light-induced nonlinear scattering and self-pumped phase conjugation in LiNbO3:Mg crystals at 351 nm," Technical Digest of IQEC-CLEO Pacific Rim, July, 2005, Tokyo, Japan, CFI1-4 (2005).
  • Y. Tomita, K. Furushima and K. Ishizu, "Organic-nanoparticle dispersed photopolymers for volume holographic recording," Technical Digest of CLEO-Europe, June, 2005, Munich, Germany, CE-3-TUE (2005).
  • H. Takahashi, J. Yamauchi and Y. Tomita, "Silica-nanoparticle-dispersed methacrylate photopolymers that include transmparent plastics as a binder host," Technical Digest of CLEO-Europe, June, 2005, Munich, Germany, CC2-1-MON (2005).
  • Y. Tomita, "Organic-inorganic nanocomposite for holographic recording with net diffraction efficiency near 100%," (invited talk), Technical Digest of the 2004 International Commission for Optics (ICO'04), July, 2004, Makuhari, Chiba, Japan, 265-266 (2004).
  • W. Zou, R. Matsushima and Y. Tomita, "Near-infrared one-color photorefractivity in Mg-doped near-stoichiometric LiNbO3 with quasi-nonvolatile readout," Technical Digest of the 2004 International Commission for Optics (ICO'04), July, 2004, Makuhari, Chiba, Japan, 369-370 (2004).
  • N. Suzuki and Y. Tomita, "Holographic recording in nanoparticles-dispersed photopolymer films," Technical Digest of the 2004 International Commission for Optics (ICO'04), July, 2004, Makuhari, Chiba, Japan, 421-422 (2004).
  • Y.Tomita, R. Matstushima, W. Zou and G. Zhang, "UV-light-gating two-color photorefractivity in Mg-doped near-stoichiometric LiNbO3," Technical Digest of the 2004 Conference on Lasers and Electro-Optics (CLEO2004), May, 2004, San Franscisco, California, U.S.A.
  • Y. Tomita, N. Suzuki and K. Chikama, "Nanoparticle-dispersed photopolymer films for holographic recording with diffraction efficiency near 100 %," Technical Digest of Particles 2004, March, 2004, Orlando, Florida, U.S.A., 65 (2004).
  • G.Zhang and Y.Tomita, "Nondestructive two-color holography in LiNbO3:Mg by use of ultraviolet-induced absorption," Technical digest of the 19th Congress of the International Commission for Optics (ICO-19), August, 2002, Firenze, Italy, SPIE Proceedings 4829, 367-368 (2002).
  • G.Zhang, Y.Tomita, X.Zhang and J.Xu, "Quasi-nonvolatile one-color holography in LiNbO3:In,Fe," Technical Digest of the 2002 Conference on Lasers and Electro-Optics (CLEO2002), May, 2002, Long Beach, California, U.S.A., 273 (2002).
  • T. Kojima, N.Suzuki and Y. Tomita, "Holographic grating formation in nanoparticle-dispersed methacrylate photopolymer films," Technical Digest of the 2002 Conference on Lasers and Electro-Optics (CLEO2002), May, 2002, Long Beach, California, U.S.A., 37-38 (2002).
  • G. Zhang, Y. Tomita, X. Zhang, and J. Xu, "Near-infrared holographic recording in LiNbO3:In,Fe with high resistance against readout erasure," Technical Digest of the Conference on Lasers and Electro- Optics (CLEO)/Pacific Rim 2001, July, 2001, Chiba, Japan, Volume II, II-448- 449 (2001).
  • G. Zhang, Y. Tomita, W. Xu, and C. Yang, "Improvement of two-color holography performance in congruent lithium niobate by doping with In," Technical Digest of the 2001 Conference on Lasers and Electro-Optics (CLEO2001), May, 2001, Baltimore, Maryland, U.S.A., 511-512 (2001).
  • G. Zhang and Y. Tomita, "Observation of very slow dark decay of light-induced charges on shallow levels in LiNbO3:Mg," Technical Digest of the 2001 Conference on Lasers and Electro-Optics (CLEO2001), May, 2001, Baltimore, Maryland, U.S.A., 510-511 (2001).
  • T. Kojima,Y. Tomita, T. Wada, S. Hayakawa, and R. Takasaki, "Dual grating formation in methacrylate photopolymer films," Proceedings of International Conference on Applications of Photonic Technology (ICAPT 2000), Quebec, Canada, June, 2000, 659-661 (2000).
  • Y. Tomita, "Self-enhanced diffraction properties of barium titanate with a thermally fixed grating," (invited talk) Proceedings of the 1998 International Photonic Conference, December , 1998, Taipei, Taiwan, 22-24 (1998.12).
  • Y. Tomita and S. Matsushima, "Two-wave mixing and hologram recording by using linear dichroism in Cu-doped potassium sodium strontium barium niobate," Proceedings of the 1998 Topical Meeting of the International Commission for Optics (ICO), August , 1998, Tianjin, China, 424 (1998)/ Journal of Optoelectronics Laser 9, Supp. 424-426 (1998.8).
  • Y. Tomita, "Physical Properties and Applications of Photorefractive Materials," (invited lecture), Lecture Notes H4.SMR/1058-9 in Winter School on Optics (11-13 February, 1998), Sponsored by International Centre for Theoretical Physics and ICO, 9-27 February, 1998, Trieste, Italy (1998.2).
  • Y. Tomita, S. Matsushima, and O. Miyazaki, "Role of ionic grating in self-enhanced readout from a thermally fixed grating in a photorefractive barium titanate crystal," Proceedings of SPIE International Symposium on Photorefractive fiber and Crystal Devices: Materials, Optical Properties and Applications III, SPIE vol. 3137, July , 1997, San Diego, California, U.S.A., 19-26 (1997.7).
  • F. Nishida and Y. Tomita, "Polarization dependent diffraction phenomenon in disperse red 1 doped photoconducting electro-optic polymer," Proceedings of topical Meeting on Photorefractive Materials, Effects, and Devices, June, 1997, Chiba, Japan, 7- 100 (1997.6).
  • K. Kusakabe and Y. Tomita, "Effect of crystal temperature on picosecond two-beam coupling gains in undoped GaAs and Ga-doped CdTe," Proceedings of topical Meeting on Photorefractive Materials, Effects, and Devices, June, 1997, Chiba, Japan, 468-471(1997.6).
  • K. Kusakabe and Y. Tomita, "Picosecond space-charge field dynamics with hot electron nonlinear transport in semi-insulating GaAs," Proceedings of topical Meeting on Photorefractive Materials, Effects, and Devices, June, 1997, Chiba, Japan, 326- 329(1997.6).
  • Y. Tomita and S. Matsushima, "Gain and pump-to-probe intensity ratio dependencies of response times in photorefractive two-beam coupling," in Proceedings of 17th Congress of the International Commission for Optics (ICO96), August, 1996, Teajon, Korea, SPIE 2778, 771-772 (1996.8).
  • J. Widjaja, A. Wahab, and Y. Tomita, "Holographic Associative Memory Using Wavelet-Matched Filters," in Proceedings of 17th Congress of the International Commission for Optics (ICO96), August, 1996, Teajon, Korea, SPIE 2778, 439-440 (1996.8).
  • Y. Tomita and T. Inoue, "Light-induced director axis reorientation in a dye-doped ferroelectric liquid crystal and its application to self-aligned spatial filtering," in Technical Digest of the 1996 Conference on Lasers and Electro-Optics (CLEO96), June, 1996, Anaheim, California, 1996 Technical Digest Series 9, 476-477 (1996.6).
  • J. Widjaja and Y. Tomita, "Photorefractive optical combinatorial digital logics," in Technical Digest of the 1996 International Topical Meeting on Optical Computing, vol. 1, April , 1996, Sendai, Japan, 152-153 (1996.4).
  • J. Widjaja and Y.Tomita, "Real-time wavelet-matched filtering using photorefractive four-wave mixing," in Proceedings of SPIE on Photorefractive fiber and Crystal Devices: Materials, Optical Properties and Applications, vol. 2529, July, 1995, San Diego, California, U.S.A. 285-289 (1995.7).
  • Y. Tomita and S. Matsushima, "Photorefractive properties of doped KNSBN crystals," (invited talk), in Proc. of Japan-U.S. Workshop on Functional Fronts in Advanced Ceramics (boundaries and defects), December, 1994, Tsukuba, Japan, 122-125 (1994.12).
  • Y.Tomita, "Temperature dependence of photorefractive properties of Cr-doped potassium sodium strontium barium niobate," in Proc. of the European Materials Research Society (E-MRS) Spring Meeting: Symposium on Photorefractive Materials, May, 1994, Strasbourg, France, 281-285 (1994.5).
  • Y. Tomita and A. Suzuki, "Broadband photorefractivities in Cr-doped SBN:60 and KNSBN crystals," in Technical Digest of the 1994 Topical Meeting of the International Commission for Optics (ICO), April , 1994, Kyoto, Japan, 171 (1994.4).
  • Y. Tomita, Shu-Wu Wu, and A. Yariv, " Temperature dependence of photorefractive beam coupling gain in semi-insulating undoped GaAs," the International Conference on the Science and Technology of Defect Control in Semiconducotrs, Yokohama, Japan, September (1989).
  • Y. Tomita, R. Yahalom, and A. Yariv, "Phase shift of a self-pumped phase-conjugate mirror," Technical Digest of the 1988 Annual Meeting of the Optical Society of America, September, 1988, Santa Clara, California, U.S.A., (OSA, Washington DC, 1988), paper FB8, 161 (1988).
  • R. Yahalom, Y. Tomita, and A. Yariv, "Effect of modal dispersal on the polarization and spatial information recovery in a fiber-coupled phase-conjugate mirror," 1987 Conference on Lasers and Electro-Optics (CLEO87), May, 1987, Baltimore, Maryland, U.S.A., (OSA, Washington DC, 1987), post deadline paper THT6, 237-238 (1987).
  • K. Nakagawa, Y. Tomita, and T. Asakura, " An elongated structure of speckle patterns in polychromatic laser light," Proceedings of 12th Congress of the International Commission for Optics (ICO81), 1981, Ensenada, Mexico, AIP Conference Proceedings 65, " Optics in Four Dimensions-1980," edited by M.A. Machado and L.M. Narducci, (American Institute of Physics, New York, 1981), 708-713 (1981).

People

Principle Investigator

    Prof. Yasuo Tomita
    Office: 205 West 1
    Voice:+81-(0)42-443-5164

    Personal Info

Administrative Secretary

    Minako Hara
    Office: 207 West 1
    Voice:+81-(0)42-443-5208

Research Associates

    Toshi Aoi
    Office: 209 West 1
    Voice:+81-(0)42-443-5208

    Yuko Iso
    Office: 209 West 1
    Voice:+81-(0)42-443-5208

Students

    Akihisa Kageyama (M1)
    Office: 209 West 1
    Kenta Satoh (M1)
    Office: 209 West 1
    Shuma Hasegawa (B4)
    Office: 209 West 1

Foreign Research Collaborators

    Prof. Martin Fally
    University of Vienna, Austria
    Personal Website
    Dr. Jürgen Klepp
    University of Vienna, Austria
    Personal Website
    Dr. Chrinstian Pruner
    University of Salzburg, Austria
    Personal Website
    Prof. Guoquan Zhang
    Nankai Univ., China
    Personal Website
    (in Chinese)
    Prof. Liyong Ren
    Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, China
    Personal Website
    Prof. Joewono Widjaja
    Suranaree Univ. of Tech., Thailand
    Personal Website
    Dr. Jinxin Guo
    College of Applied Science, Beijing University of Technology, China

Past Postdoctral Research Associates

  • Dr. Jinxin Guo (Beijing University of Technology, China)
  • Prof. Liyong Ren (Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, China)
  • Dr. Haijin Qiao (Department of Physics and Astronomy, University of British Columbia, Canada)
  • Dr. Hiroshi Takahashi (Gemological Institute of America, USA)
  • Prof. Guoquan Zhang (Nankai Univ., China)
  • Prof. Joewono Widjaja (Suranaree Univ. of Tech., Thailand)
  • Dr. Johan Bergquist (Nokia Research Center, Tokyo)

Courses

    Undergraduate
  • Electromagnetism II (For sophomores, Dept. of Engineering Science)
  • Optical Engineering (For seniors, Dept. of Engineering Science)
    Graduate school
  • Solid-state and soft matter photonics (For graduates)
    JUSST program (English class)
  • Modern Optics and Photonics (JUSST program)   Website

Download Flash plug-in.

Radiation from an electric dipole*


Download Flash plug-in.

Propagation of a plane em wave*


Download Flash plug-in.

Left-handed polarization


Download Flash plug-in.

Fraunhofer diffraction from a rectangular aperture


* Visualization applets from the course materials of "Electricity and Magnetism" in MIT OpenCourseWare.


Contact

Address
 205 West 1 building, Department of Engineering Science, University of Electro-Communications
 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan

Voice
 +81-(0)42-443-5164
E-mail
 ytomita[at]uec.ac.jp