Faculty Profiles - OKAMOTO Takashi

Papers - OKAMOTO Takashi

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Fundamental study on optical control of particles for production of random laser medium

Yokoi Naomichi, Okamoto Takashi, Aizu Yoshihisa

The Proceedings of the Symposium on Micro-Nano Science and Technology ( The Japan Society of Mechanical Engineers ) 2018.9 ( 0 ) 30am3PN33 2018.01

Language：Japanese Publishing type：Research paper (conference, symposium, etc.)

<p>Optical trapping and guiding using laser have been proven to be useful for non-contact and non-invasive manipulation of small objects such as biological cells, organelles within cells, and dielectric particles. We have numerically investigated so far the motion of a Brownian particle suspended in still water under illumination of a speckle pattern generated by interference of coherent light scattered by a rough object. In the present study, we numerically investigate the motion of titanium dioxide particles in a photo-curing resin under the illumination of a speckle pattern. Trajectory of the particle is simulated in relation to its size and, power and size of the speckle grains to confirm the feasibility of the present method for performing optical trapping and guiding of the particle in the photo-curing resin. The present method is expected to be applied to the fabrication of a random laser medium.</p>

DOI： 10.1299/jsmemnm.2018.9.30am3pn33

CiNii Article

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmemnm/2018.9/0/2018.9_30am3PN33/_pdf

Effects of inhomogeneity in distribution of scatterers on random laser emission Reviewed

T. Okamoto, M. Mori, T. Haruno

2017 Conference on Lasers and Electro-Optics Pacific Rim, CLEO-PR 2017 2017-January 1 - 3 S2349 2017.11

Authorship：Corresponding author Language：English Publishing type：Research paper (international conference proceedings)

Singapore Singapore 2017.07.31 - 2017.08.04

DOI： 10.1109/CLEOPR.2017.8119021

Scopus

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85044175793&origin=inward

A novel analytical method of facial skin blood flow by laser speckle flowgraphy (LSFG) Reviewed

Y. Nagashima, Y. Ohsugi, M. Hiraishi, Y. Niki, K. Maeda, T. Okamoto

Extended Abstracts of the 24th Congress of International Commission for Optics (ICO-24) P6-07 2017.08

Theoretical and numerical analysis of light scattering from the human skin surface based on wave optics Reviewed

T. Okamoto, R. Sakai, T. Igarashi, M. Takabayashi

Extended Abstracts of the 24th Congress of International Commission for Optics (ICO-24) Th1B-02 2017.08

光波工学研究室（色材サロン（大学・研究所めぐり）） Invited

岡本卓, 高林正典

色材協会誌 ( 色材協会 ) 90 ( 7 ) 253 - 254 2017.07

Random lasing in dye-doped polymer random media with a bubble structure Reviewed

T. Okamoto, R. Yoshitome

Journal of the Optical Society of America B ( Optical Society of America ) 34 ( 7 ) 1497 - 1502 2017.06

Effects of inhomogeneity in distribution of scatterers on random laser emission Reviewed International journal

Okamoto T., Mori M., Haruno T.

Optics InfoBase Conference Papers Part F122-CLEOPR 2017 2017.01

Design of writing patterns for multi-level self-referential holographic data storage by phase-only modulation Reviewed

Daiki Murozono, Masanori Takabayashi, Takashi Okamoto

International Workshop on Holography and Related Technologies (IWH 2016) Digest 2016.11

Signal modulation, recording, and detection error characteristics in pseudo-spatial quadrature amplitude modulation-based holographic data storage system Reviewed

Masanori Takabayashi, Yuya Sakaki, Takashi Okamoto

International Symposium on Optical Memory (ISOM '16) Technical Digest 2016.10

Inter-page crosstalk analyses in 3D multiplexed self-referential holographic data storage Reviewed

Taisuke Eto, Masanori Takabayashi, Takashi Okamoto

International Symposium on Optical Memory (ISOM '16) Technical Digest 2016.10

Numerical simulations on the focus-shift multiplexing technique for self-referential holographic data storage Reviewed

Masanori Takabayashi, Taisuke Eto, Takashi Okamoto

Optical Review 23 ( 6 ) 987 - 996 2016.08

Numerical simulations on inter-page crosstalk characteristics in three-dimensional shift multiplexed self-referential holographic data storage Reviewed

Taisuke Eto, Masanori Takabayashi, Atsushi Okamoto, Masatoshi Bunsen, Takashi Okamoto

Japanese Journal of Applied Physics 55 ( 8 ) 08RD01-1 - 08RD01-7 2016.07

Theoretical and numerical analysis of light reflection from the human skin based on wave optics Reviewed

R. Sakai, T. Igarashi, M. Takabayashi, T. Okamoto

Proceedings of Biomedical Imaging and Sensing Conference 2016 (BISC '16) BISCp6-21 2016.05

Treatment of Light Phenomena in the Context of Wave and Electromagnetic Optics Invited

OKAMOTO Takashi

Journal of the Japan Society of Colour Material ( Japan Society of Colour Material ) 89 ( 3 ) 93 - 97 2016.03

Authorship：Corresponding author Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (scientific journal)

Propagation and scattering of light in a medium is one of the major topics in the study of color materials as well as in many other research fields. Several optical theories dealing with the topic have been developed so far, including geometrical optics and quantum optics. If the minimum length scale of an object of interest is much larger than the wavelength of light, we can discuss the problems of light reflection and refraction by treating the light as rays. For smaller length scales, however, there are some phenomena which cannot be described by geometrical optics. In this case, we need to treat light as scalar or vector waves. The present article presents the theoretical treatment of light phenomena in the context of wave and electromagnetic optics. The finite-difference time-domain method is introduced as a numerical method for analyzing light propagation and scattering in complex media.

DOI： 10.4011/shikizai.89.93

CiNii Article

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/shikizai/89/3/89_93/_pdf

Self-Referential Holographic Data Storage using Recording Beam with Inhomogeneous Spatial Amplitude Distribution

Masanori Takabayashi, Daiki Murozono, Takashi Okamoto

40 ( 6 ) 131 - 134 2016.02

Focus-Shift Multiplexing Technique by Wavefront Modulation for Self-Referential Holographic Data Storage Reviewed

Masanori Takabayashi, Taisuke Eto, Takashi Okamoto

IWH 2015 Technical Digest 2015.12

Numerical simulations on 3D shift multiplexed self-referential holographic data storage: shift multiplexing properties along z-axis Reviewed

Taisuke Eto, Masanori Takabayashi, Atsushi Okamoto, Masatoshi Bunsen, Takashi Okamoto

THE TWENTIETH MICROOPTICS CONFERENCE (MOC'15) TECHNICAL DIGEST 112 - 113 2015.10

Recording procedures for high-quality signal readout in self-referential holographic data storage Reviewed

Masanori Takabayashi, Atsushi Okamoto, Taisuke Eto, Takashi Okamoto

Applied Optics 54 ( 16 ) 5167 - 5174 2015.06

Numerical simulations on design and detection of spatial quadrature amplitude modulated signals for high-density holographic data storage

Masanori Takabayashi, Toshiyuki Nakai, Kento Ryu, Atsushi Okamoto, Jin Nozawa, Takashi Okamoto

39 ( 7 ) 21 - 26 2015.02

Laser emission from random gain media with bubble structures Reviewed

T. Okamoto, S. Matsushita and M. Takabayashi

Proceedings of the Tenth International Conference on Laser-light and Interactions with Particles (LIP2014) NR-1 2014.08

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Papers - OKAMOTO Takashi