研究者詳細 - 岡本　卓

論文 - 岡本　卓

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ランダムレーザー媒質作製に向けた光学的な微粒子制御に関する基礎的検討

横井直倫, 岡本卓, 相津佳永

マイクロ・ナノ工学シンポジウム ( 一般社団法人日本機械学会 ) 2018.9 ( 0 ) 30am3PN33 2018年01月

記述言語：日本語掲載種別：研究論文（研究会，シンポジウム資料等）

<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

その他リンク： 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 査読有り

T. Okamoto, M. Mori, T. Haruno

2017 Conference on Lasers and Electro-Optics Pacific Rim, CLEO-PR 2017 2017-January 1 - 3 S2349 2017年11月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Singapore Singapore 2017年07月31日 - 2017年08月04日

The properties of incoherent-feedback random lasing are investigated for dye-doped polymer random media in which non-scattering regions are distributed. Experimental results show that for random media with inhomogeneous structures, the spectral peak intensity increases and the spectral width decreases compared to a homogeneous medium with the same transport mean free path.

DOI： 10.1109/CLEOPR.2017.8119021

Scopus

その他リンク： 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) 査読有り

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年08月

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

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

Extended Abstracts of the 24th Congress of International Commission for Optics (ICO-24) Th1B-02 2017年08月

光波工学研究室（色材サロン（大学・研究所めぐり））招待有り

岡本卓, 高林正典

色材協会誌 ( 色材協会 ) 90 ( 7 ) 253 - 254 2017年07月

Random lasing in dye-doped polymer random media with a bubble structure 査読有り

T. Okamoto, R. Yoshitome

Journal of the Optical Society of America B ( Optical Society of America ) 34 ( 7 ) 1497 - 1502 2017年06月

Effects of inhomogeneity in distribution of scatterers on random laser emission 査読有り国際誌

Okamoto T., Mori M., Haruno T.

Optics InfoBase Conference Papers Part F122-CLEOPR 2017 2017年01月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85059510569&origin=inward

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

Daiki Murozono, Masanori Takabayashi, Takashi Okamoto

International Workshop on Holography and Related Technologies (IWH 2016) Digest 2016年11月

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

Masanori Takabayashi, Yuya Sakaki, Takashi Okamoto

International Symposium on Optical Memory (ISOM '16) Technical Digest 2016年10月

Inter-page crosstalk analyses in 3D multiplexed self-referential holographic data storage 査読有り

Taisuke Eto, Masanori Takabayashi, Takashi Okamoto

International Symposium on Optical Memory (ISOM '16) Technical Digest 2016年10月

Numerical simulations on the focus-shift multiplexing technique for self-referential holographic data storage 査読有り

Masanori Takabayashi, Taisuke Eto, Takashi Okamoto

Optical Review 23 ( 6 ) 987 - 996 2016年08月

記述言語：英語掲載種別：研究論文（学術雑誌）

For increasing the data density of holographic data storage (HDS), combining more than two multiplexing techniques is effective. This is also true in self-referential holographic data storage (SR-HDS) that enables holographic recording purely with a single beam. In this paper, a focus-shift multiplexing technique is applied to xy-shift multiplexed SR-HDS, the feasibility of which has been shown in our previous work. The focus-shift multiplexing technique enables the multiplexing of datapages by slightly changing the focal length of the objective lens. However, the required focus-shift distance for multiplexing and the implementation method of the focus-shift have not been clarified. First, the focus-shift selectivity is investigated by the numerical simulations. In the case where the focus-shift multiplexing technique is applied to xy-shift multiplexed SR-HDS, the inter-page crosstalk properties are clarified to decide the recording layout that can achieve a low-crosstalk readout. Second, the technique of displaying an additional phase pattern onto the spatial light modulator (SLM) is introduced, which is a focus-shift method without any special optical components, such as varifocal lenses. Finally, we investigate the relationship between the accuracy of the focus-shift and the parameters of SLM.

DOI： 10.1007/s10043-016-0254-2

Scopus

その他リンク： http://link.springer.com/article/10.1007/s10043-016-0254-2

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

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

Japanese Journal of Applied Physics 55 ( 8 ) 08RD01-1 - 08RD01-7 2016年07月

記述言語：英語掲載種別：研究論文（学術雑誌）

A three-dimensional (3D) shift multiplexing technique is applied to increase the number of multiplexed datapages in self-referential holographic data storage (SR-HDS), enabling holographic recording with purely one-beam geometry. In the 3D shift multiplexing technique, the recording medium is shifted not only along the x-and y-axes but also along the z-axis to multiplex the datapages. Because the shift directions in the 3D shift multiplexing technique are expanded compared with the conventional 2D technique, the number of multiplexed datapages is expected to be increased. We numerically clarify the appropriate 3D recording layout of holograms in which the effect of the inter-page crosstalk can be reduced after showing that datapages are multiplexed on shifting the recording medium along the z-axis. The results show 3D shift multiplexing can effectively realize high-density SR-HDS when appropriately designed layouts are used.

DOI： 10.7567/JJAP.55.08RD01

Scopus

CiNii Article

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84989311425&origin=inward

Theoretical and numerical analysis of light reflection from the human skin based on wave optics 査読有り

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

Proceedings of Biomedical Imaging and Sensing Conference 2016 (BISC ’16) BISCp6-21 2016年05月

波動や電磁波としての光の解析招待有り

岡本卓

色材協会誌 ( 色材協会 ) 89 ( 3 ) 93 - 97 2016年03月

担当区分：責任著者記述言語：日本語掲載種別：記事・総説・解説・論説等（学術雑誌）

媒質中の光の伝搬および散乱は，色材を扱う分野をはじめとして多くの分野で重要な研究テーマとなっている。その解を与える光学理論は，幾何光学から量子光学まで，解析対象の性質に応じてさまざまなものが構築されてきた。波長に比べて十分に大きなスケールしかもたないものであれば，光を光線とみなして反射・屈折を議論すれば十分である。しかし，小さなスケールになるとそれでは説明が付かない現象があらわれる。この場合，光をスカラー波やベクトル波として取り扱う必要が生じる。本稿では，光を波動や電磁波として解析するための理論的な取り扱いについて説明する。また，数値解析を行うための手法の一つである，時間領域差分法を紹介する。

DOI： 10.4011/shikizai.89.93

CiNii Article

CiNii Research

その他リンク： https://www.jstage.jst.go.jp/article/shikizai/89/3/89_93/_pdf

不均一な空間振幅分布を有する記録光を用いた自己参照型ホログラフィックメモリ

高林正典，室園大貴，岡本卓

映像情報メディア学会技術報告 40 ( 6 ) 131 - 134 2016年02月

Focus-Shift Multiplexing Technique by Wavefront Modulation for Self-Referential Holographic Data Storage 査読有り

Masanori Takabayashi, Taisuke Eto, Takashi Okamoto

IWH 2015 Technical Digest 2015年12月

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

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

THE TWENTIETH MICROOPTICS CONFERENCE (MOC'15) TECHNICAL DIGEST 112 - 113 2015年10月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Japan Fukuoka 2015年10月25日 - 2015年10月28日

The 3D shift multiplexing method for high-density self-referential holographic data storage is proposed. As the fundamental evaluations of the proposed method, we focus on the multiplexing properties along the z-axis. Concretely, we demonstrate the z-shift multiplexing of 25 datapages after clarifying the shift selectivity along the z-axis.

DOI： 10.1109/MOC.2015.7416418

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84969560180&origin=inward

Recording procedures for high-quality signal readout in self-referential holographic data storage 査読有り

Masanori Takabayashi, Atsushi Okamoto, Taisuke Eto, Takashi Okamoto

Applied Optics 54 ( 16 ) 5167 - 5174 2015年06月

ホログラフィックメモリの大容量化に向けた空間直交振幅変調信号の設計と検出に関するシミュレーション

高林正典，中井俊之，龍建斗，岡本淳，野澤仁，岡本卓

映像情報メディア学会技術報告 39 ( 7 ) 21 - 26 2015年02月

Laser emission from random gain media with bubble structures 査読有り

T. Okamoto, S. Matsushita and M. Takabayashi

Proceedings of the Tenth International Conference on Laser-light and Interactions with Particles (LIP2014) NR-1 2014年08月

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