2024年12月, 浜松電子工学奨励会, 高柳研究奨励賞　　　　　　　　　　　　　　　
超高速かつ超広視野な回折限界集光技術の開発
渋川 敦史

2021年02月, 公益財団法人コニカミノルタ科学技術振興財団, 令和２年度コニカミノルタ画像科学奨励賞　　　　　　　　　　　　　　　
世界最速一次元空間光変調器の開発と光波面シェイピングへの応用
渋川 敦史

Large-volume focus control at 10 MHz refresh rate via fast line-scanning amplitude-encoded scattering-assisted holography
Atsushi Shibukawa, Ryota Higuchi, Gookho Song, Hideharu Mikami, Yuki Sudo, Mooseok Jang
Nature Communications, 15, 1, Springer Science and Business Media LLC, 2024年04月08日, ［査読有り］, ［筆頭著者］
研究論文（学術雑誌）, Abstract

The capability of focus control has been central to optical technologies that require both high temporal and spatial resolutions. However, existing varifocal lens schemes are commonly limited to the response time on the microsecond timescale and share the fundamental trade-off between the response time and the tuning power. Here, we propose an ultrafast holographic focusing method enabled by translating the speed of a fast 1D beam scanner into the speed of the complex wavefront modulation of a relatively slow 2D spatial light modulator. Using a pair of a digital micromirror device and a resonant scanner, we demonstrate an unprecedented refresh rate of focus control of 31 MHz, which is more than 1,000 times faster than the switching rate of a digital micromirror device. We also show that multiple micrometer-sized focal spots can be independently addressed in a range of over 1 MHz within a large volume of 5 mm × 5 mm × 5.5 mm, validating the superior spatiotemporal characteristics of the proposed technique – high temporal and spatial precision, high tuning power, and random accessibility in a three-dimensional space. The demonstrated scheme offers a new route towards three-dimensional light manipulation in the 100 MHz regime.

Detection of Membrane Potential-Dependent Rhodopsin Fluorescence Using Low-Intensity Light Emitting Diode for Long-Term Imaging
Shiho Kawanishi, Keiichi Kojima, Atsushi Shibukawa, Masayuki Sakamoto, Yuki Sudo
ACS Omega, 8, 4826, 4834, American Chemical Society (ACS), 2023年01月25日, ［査読有り］, ［国際誌］
英語, 研究論文（学術雑誌）

Functional expression of the eukaryotic proton pump rhodopsin OmR2 in Escherichia coli and its photochemical characterization.
Masuzu Kikuchi, Keiichi Kojima, Shin Nakao, Susumu Yoshizawa, Shiho Kawanishi, Atsushi Shibukawa, Takashi Kikukawa, Yuki Sudo
Scientific reports, 11, 1, 14765, 14765, 2021年07月20日, ［査読有り］, ［国際誌］
英語, 研究論文（学術雑誌）, Microbial rhodopsins are photoswitchable seven-transmembrane proteins that are widely distributed in three domains of life, archaea, bacteria and eukarya. Rhodopsins allow the transport of protons outwardly across the membrane and are indispensable for light-energy conversion in microorganisms. Archaeal and bacterial proton pump rhodopsins have been characterized using an Escherichia coli expression system because that enables the rapid production of large amounts of recombinant proteins, whereas no success has been reported for eukaryotic rhodopsins. Here, we report a phylogenetically distinct eukaryotic rhodopsin from the dinoflagellate Oxyrrhis marina (O. marina rhodopsin-2, OmR2) that can be expressed in E. coli cells. E. coli cells harboring the OmR2 gene showed an outward proton-pumping activity, indicating its functional expression. Spectroscopic characterization of the purified OmR2 protein revealed several features as follows: (1) an absorption maximum at 533 nm with all-trans retinal chromophore, (2) the possession of the deprotonated counterion (pKa = 3.0) of the protonated Schiff base and (3) a rapid photocycle through several distinct photointermediates. Those features are similar to those of known eukaryotic proton pump rhodopsins. Our successful characterization of OmR2 expressed in E. coli cells could build a basis for understanding and utilizing eukaryotic rhodopsins.

Green-Sensitive, Long-Lived, Step-Functional Anion Channelrhodopsin-2 Variant as a High-Potential Neural Silencing Tool
Keiichi Kojima, Natsuki Miyoshi, Atsushi Shibukawa, Srikanta Chowdhury, Masaki Tsujimura, Tomoyasu Noji, Hiroshi Ishikita, Akihiro Yamanaka, Yuki Sudo
The Journal of Physical Chemistry Letters, 11, 15, 6214, 6218, American Chemical Society (ACS), 2020年07月22日, ［査読有り］, ［国際誌］
英語, 研究論文（学術雑誌）, Anion channelrhodopsin-2 (GtACR2) was identified from the alga Guillardia theta as a light-gated anion channel, providing a powerful neural silencing tool for optogenetics. To expand its molecular properties, we produced here GtACR2 variants by strategic mutations on the four residues around the retinal chromophore (i.e., R129, G152, P204, and C233). After the screening with the Escherichia coli expression system, we estimated spectral sensitivities and the anion channeling function by using the HEK293 expression system. Among the mutants, triple (R129M/G152S/C233A) and quadruple (R129M/G152S/P204T/C233A) mutants showed the significantly red-shifted absorption maxima (λmax = 498 and 514 nm, respectively) and the long-lived channel-conducting states (the half-life times were 3.4 and 5.4 s, respectively). In addition, both mutants can be activated and inactivated by different wavelengths, representing their step-functional ability. We nicknamed the quadruple mutant "GLaS-ACR2" from its green-sensitive, long-lived, step-functional properties. The unique characteristics of GLaS-ACR2 suggest its high potential as a neural silencing tool.

The Unlimited Potential of Microbial Rhodopsins as Optical Tools　　　　　　　　　　　　　　　
K. Kojima, A. Shibukawa, Y. Sudo
Biochemistry, 59, 3, 218, 229, 2019年12月, ［査読有り］, ［招待有り］
英語, 研究論文（学術雑誌）

Quantitation of the neural silencing activity of anion channelrhodopsins in Caenorhabditis elegans and their applicability for long-term illumination　　　　　　　　　　　　　　　
T. Yamanashi, M. Maki, K. Kojima, A. Shibukawa, T. Tsukamoto, S. Chowdhury, A. Yamanaka, S. Takagi, Y. Sudo
Scientific Reports, 9, 7863, 2019年05月, ［査読有り］
英語, 研究論文（学術雑誌）

Photochemical Characterization of a New Heliorhodopsin from the Gram-Negative Eubacterium Bellilinea caldifistulae (BcHeR) and Comparison with Heliorhodopsin-48C12　　　　　　　　　　　　　　　
A. Shibukawa, K. Kojima, Y. Nakajima, Y. Nishimura, S. Yoshizawa, Y. Sudo
Biochemistry, 58, 26, 2934, 2943, 2019年05月, ［査読有り］, ［筆頭著者］
英語, 研究論文（学術雑誌）

Virtual phase conjugation based optical tomography for single-shot three-dimensional imaging　　　　　　　　　　　　　　　
Yuta Goto, Atsushi Okamoto, Atsushi Shibukawa, Kazuhisa Ogawa, Akihisa Tomita
Optics Express, 26, 3779, 3790, 2018年02月, ［査読有り］
英語, 研究論文（学術雑誌）

Wavefront engineering with disorder-engineered metasurfaces
Mooseok Jang†, Yu Horie†, Atsushi Shibukawa†, Joshua Brake, Yan Liu, Seyedeh Mahsa Kamali, Amir Arbabi, HaowenRuan, Andrei Faraon, Changhuei Yang
Nature Photonics, 12, 84, 90, 2018年02月, ［査読有り］, ［筆頭著者］
英語, 研究論文（学術雑誌）

Glare suppression by coherence gated negation
Edward Haojiang Zhou, Atsushi Shibukawa, Joshua Brake, Haowen Ruan, Changhuei Yang
OPTICA, 3, 10, 1107, 1113, OPTICAL SOC AMER, 2016年10月, ［査読有り］
英語, 研究論文（学術雑誌）, Imaging of a weak target hidden behind a scattering medium can be significantly confounded by glare. We report a method, termed coherence gated negation (CGN), that uses destructive optical interference to suppress glare and allow improved imaging of a weak target. As a demonstration, we show that by permuting through a set range of amplitude and phase values for a reference beam interfering with the optical field from the glare and target reflection, we can suppress glare by an order of magnitude, even when the optical wavefront is highly disordered. This strategy significantly departs from conventional coherence gating methods in that CGN actively "gates out" the unwanted optical contributions while conventional methods "gate in" the target optical signal. We further show that the CGN method can outperform conventional coherence gating image quality in certain scenarios by more effectively rejecting unwanted optical contributions. (C) 2016 Optical Society of America

Towards new applications using capillary waveguides
Nicolino Stasio†, Atsushi Shibukawa†, Ioannis N, Papadopoulos, Salma Farahi, Olivier Simandoux, Jean-Pierre Huignard, Emmanuel Bossy, Christophe Moser, Demetri Psaltis
BIOMEDICAL OPTICS EXPRESS, 6, 12, 4619, 4631, OPTICAL SOC AMER, 2015年12月, ［査読有り］, ［筆頭著者］
英語, 研究論文（学術雑誌）, In this paper we demonstrate the enhancement of the sensing capabilities of glass capillaries. We exploit their properties as optical and acoustic waveguides to transform them potentially into high resolution minimally invasive endoscopic devices. We show two possible applications of silica capillary waveguides demonstrating fluorescence and optical-resolution photoacoustic imaging using a single 330 mu m-thick silica capillary. A nanosecond pulsed laser is focused and scanned in front of a capillary by digital phase conjugation through the silica annular ring of the capillary, used as an optical waveguide. We demonstrate optical-resolution photoacoustic images of a 30 mu m-thick nylon thread using the water-filled core of the same capillary as an acoustic waveguide, resulting in a fully passive endoscopic device. Moreover, fluorescence images of 1.5 mu m beads are obtained collecting the fluorescence signal through the optical waveguide. This kind of silica-capillary waveguide together with wavefront shaping techniques such as digital phase conjugation, paves the way to minimally invasive multi-modal endoscopy. (C) 2015 Optical Society of America

Two-channel algorithm for single-shot, high-resolution measurement of optical wavefronts using two image sensors
Jin Nozawa, Atsushi Okamoto, Atsushi Shibukawa, Masanori Takabayashi, Akihisa Tomita
APPLIED OPTICS, 54, 29, 8644, 8652, OPTICAL SOC AMER, 2015年10月, ［査読有り］
英語, 研究論文（学術雑誌）, We propose a two-channel holographic diversity interferometer (2ch-HDI) system for single-shot and highly accurate measurements of complex amplitude fields with a simple optical setup. In this method, two phase-shifted interference patterns are generated, without requiring a phase-shifting device, by entering a circularly polarized reference beam into a polarizing beam splitter, and the resulting patterns are captured simultaneously using two image sensors. However, differences in the intensity distributions of the two image sensors may lead to serious measurement errors. Thus, we also develop a two-channel algorithm optimized for the 2ch-HDI to compensate for these differences. Simulation results show that this algorithm can compensate for such differences in the intensity distributions in the two image sensors. Experimental results confirm that the combination of the 2ch-HDI and the calculation algorithm significantly enhances measurement accuracy. (c) 2015 Optical Society of America

Background light reduction method with a double phase conjugate mirror and a phase plate for optical inter-satellite communications
Kaori Nishimaki, Atsushi Okamoto, Atsushi Shibukawa, Akihisa Tomita, Yoshihisa Takayama, Masatoshi Bunsen
JAPANESE JOURNAL OF APPLIED PHYSICS, 53, 8, 08MB13, IOP PUBLISHING LTD, 2014年07月, ［査読有り］
英語, 研究論文（学術雑誌）, In optical intersatellite communication, the background light consisting mainly of sunlight decrease transmission rate with increasing bit error. A spatial filtering system using a double-phase-conjugate mirror (DPCM) and a phase plate is proposed to block the background light, which cannot be filtered out by using wavelength filters, polarization filters, or dousers. In this system, the effect of wavefront distortion caused by the phase plate and the compensation effect of the distortion by phase conjugate light from the DPCM are effectively combined for spatially separating signal light and background light. We demonstrated the reduction of the background light by the proposed system and optimized the phase plate for maximizing this reduction effect. As a result, it was clarified that the transmission rate can be drastically improved up to 11-fold. (C) 2014 The Japan Society of Applied Physics

Dynamically Reconfigurable Characteristics of a Double Phase Conjugate Mirror Using Sn2P2S6 Crystals and Their Application to Optical Inter-Satellite Communication
Kaori Nishimaki, Atsushi Okamoto, Atsushi Shibukawa, Masanori Takabayashi, Akihisa Tomita, Yoshihisa Takayama
OPTICAL REVIEW, 21, 3, 415, 424, OPTICAL SOC JAPAN, 2014年05月, ［査読有り］
英語, 研究論文（学術雑誌）, A double phase conjugate mirror (DPCM), created by two mutually incoherent beams entering photorefractive nonlinear materials, can generate a phase conjugate beam whose reflectivity may be greater than 100%. Even though the conditions of the incident beams are changed, the DPCM can be dynamically reconfigured by using a Sn2P2S6 crystal with a high response speed. These features of the DPCM are advantageous, particularly in an optical inter-satellite communication system. In particular, use of the phase conjugate beam from the DPCM offers wavefront compensation and amplification in satellite communication. In addition, the dynamically reconfigurable DPCM using a Sn2P2S6 crystal relaxes the acquisition accuracy of the signal beam in the system. In this study, the temporal and spatial operating characteristics of the DPCM using a Sn2P2S6 crystal were first clarified. Next, an inter-satellite system based on the DPCM was proposed, and it was demonstrated that our system significantly improves the tolerance of the acquisition accuracy and tracking time. (C) 2014 The Japan Society of Applied Physics

Digital phase conjugate mirror by parallel arrangement of two phase-only spatial light modulators
Atsushi Shibukawa, Atsushi Okamoto, Yuta Goto, Satoshi Honma, Akihisa Tomita
OPTICS EXPRESS, 22, 10, 11918, 11929, OPTICAL SOC AMER, 2014年05月, ［査読有り］, ［筆頭著者］
英語, 研究論文（学術雑誌）, In a conventional digital phase conjugation system, only the phase of an input light is time-reversed. This deteriorates phase conjugation fidelity and restricts application fields to specific cases only when the input light has uniformly-distributed scattered wavefront. To overcome these difficulties, we present a digital phase conjugate mirror based on parallel alignment of two phase-only spatial light modulators (SLMs), in which both amplitude and phase of the input light can be time-reversed. Experimental result showed that, in the phase conjugation through a holographic diffuser with diffusion angle of 0.5 degree, background noises decrease to 65% by our digital phase conjugation mirror. (C)2014 Optical Society of America

光複素振幅制御技術を用いた超高密度ホログラフィックメモリに関する研究　　　　　　　　　　　　　　　
渋川敦史
北海道大学, 2014年03月, ［査読有り］, ［招待有り］
日本語, 学位論文（博士）

Spatial cross modulation method using a random diffuser and phase-only spatial light modulator for constructing arbitrary complex fields
Atsushi Shibukawa, Atsushi Okamoto, Masanori Takabayashi, Akihisa Tomita
OPTICS EXPRESS, 22, 4, 3968, 3982, OPTICAL SOC AMER, 2014年02月, ［査読有り］, ［筆頭著者］
英語, 研究論文（学術雑誌）, We propose a spatial cross modulation method using a random diffuser and a phase-only spatial light modulator (SLM), by which arbitrary complex-amplitude fields can be generated with higher spatial resolution and diffraction efficiency than off-axis and double-phase computer-generated holograms. Our method encodes the original complex object as a phase-only diffusion image by scattering the complex object using a random diffuser. In addition, all incoming light to the SLM is consumed for a single diffraction order, making a diffraction efficiency of more than 90% possible. This method can be applied for holographic data storage, three-dimensional displays, and other such applications. (C) 2014 Optical Society of America

Reconfigurable spatial mode conversion using a phase-type spatial light modulator　　　　　　　　　　　　　　　
Tomohiro Maeda, Atsushi Okamoto, Yuki Hirasaki, Atsushi Shibukawa, Akihisa Tomita
2014 OptoElectronics and Communication Conference, OECC 2014 and Australian Conference on Optical Fibre Technology, ACOFT 2014, 517, 518, IEEE Computer Society, 2014年
英語, 研究論文（国際会議プロシーディングス）, We propose the reconfigurable spatial mode conversion method using a phase-type spatial light modulator, and implement the experiment for interconversion among LP01, LP11, and higher-order spatial modes. © 2014 Engineers Australia.

Double-Referential Holography and Spatial Quadrature Amplitude Modulation
Keisuke Zukeran, Atsushi Okamoto, Masanori Takabayashi, Atsushi Shibukawa, Kunihiro Sato, Akihisa Tomita
JAPANESE JOURNAL OF APPLIED PHYSICS, 52, 9, 09LD13, IOP PUBLISHING LTD, 2013年09月, ［査読有り］
英語, 研究論文（学術雑誌）, We proposed a double-referential holography (DRH) that allows phase-detection without external additional beams. In the DRH, phantom beams, prepared in the same optical path as signal beams and preliminary multiplexed in a recording medium along with the signal, are used to produce interference fringes on an imager for converting a phase into an intensity distribution. The DRH enables stable and high-accuracy phase detection independent of the fluctuations and vibrations of the optical system owing to medium shift and temperature variation. Besides, the collinear arrangement of the signal and phantom beams leads to the compactness of the optical data storage system. We conducted an experiment using binary phase modulation signals for verifying the DRH operation. In addition, 38-level spatial quadrature amplitude modulation signals were successfully reproduced with the DRH by numerical simulation. Furthermore, we verified that the distributed phase-shifting method moderates the dynamic range consumption for the exposure of phantom beams. (c) 2013 The Japan Society of Applied Physics

Digital Image Diffusion Technique for Suppressing Interpage Crosstalk in Holographic Data Storage
Atsushi Shibukawa, Atsushi Okamoto, Yuta Wakayama, Akihisa Tomita, Hisatoshi Funakoshi, Kunihiro Sato
JAPANESE JOURNAL OF APPLIED PHYSICS, 52, 9, 09LD03, IOP PUBLISHING LTD, 2013年09月, ［査読有り］, ［筆頭著者］
英語, 研究論文（学術雑誌）, To suppress interpage crosstalk that strongly restricts holographic data storage capacity, a digital image diffusion technique was proposed. In this technique, signal and crosstalk components are separated from the propagation angle difference produced by using a random diffuser and the nature of phase conjugate lights. The most attractive feature of the technique is that crosstalk suppression can be conducted while mostly keeping the conventional holographic data storage system unchanged by integrating optical processing and digital processing effectively. The connection between the two types of processing is realized by using two spatial light modulators for complex amplitude generation and phase detection methods for complex amplitude measurement. The simulation results showed that the proposed technique could increase the recording density 5.5-fold and reduce the shift pitch by a factor of 5 in comparison with conventional multiplexing methods when the diffusion angle of the diffuser is 10 degrees. (c) 2013 The Japan Society of Applied Physics

多層化コリニアホログラムによる超高密度記録　　　　　　　　　　　　　　　
岡本淳, 渋川敦史
光学, 40, 11, 591, 593, 2011年11月, ［招待有り］
日本語, 研究論文（学術雑誌）

Multilayer Collinear Holographic Memory with Movable Random Phase Mask
Atsushi Shibukawa, Atsushi Okamoto, Akihisa Tomita, Masanori Takabayashi, Kunihiro Sato
JAPANESE JOURNAL OF APPLIED PHYSICS, 50, 9, 09ME10, JAPAN SOC APPLIED PHYSICS, 2011年09月, ［査読有り］
英語, 研究論文（学術雑誌）, We proposed a new multilayer collinear holographic memory (MCHM) with a movable random phase mask that can act as an interlayer crosstalk reducer. First, to clarify the feasibility of our proposed device, we showed that it has an extremely sharp shift selectivity along the thickness direction of medium of nearly 5.0 mu m when the numerical aperture of the objective lens is 0.60. Next, we demonstrated that the utilization of the movable random phase mask can suppress interlayer crosstalk sufficiently, resulting in the improvement in the quality of reconstructed signals. Moreover, we revealed that the MCHM, in which the parallel use of a multilayered technique and collinear shift multiplexing is performed, brings out the medium potential sufficiently in terms of signal to noise ratio and medium dynamic range consumption. Finally, we verified that the MCHM can achieve a nearly 2 times larger data density at least compared with a conventional collinear holographic memory. (C) 2011 The Japan Society of Applied Physics

Evaluation of the performance in multilayer collinear holographic memory with movable random phase mask
Atsushi Shibukawa, Atsushi Okamoto, Akihisa Tomita, Masanori Takabayashi, Kunihiro Sato, Masatoshi Bunsen
Optics InfoBase Conference Papers, Optical Society of America (OSA), 2011年
英語, 研究論文（国際会議プロシーディングス）

High-speed full motion analysis based on FFT-BPM for collinear holographic memory
Hisatoshi Funakoshi, Atsushi Okamoto, Masanori Takabayashi, Yuta Wakayama, Atsushi Shibukawa
Optics InfoBase Conference Papers, Optical Society of America (OSA), 2011年
英語, 研究論文（国際会議プロシーディングス）, Our new analysis tool can be capable of calculations more than 30 times faster than the previous method and enables to estimate practical memory densities including not only recording and reconstruction process but also error correction process. © 2011 OSA.

Double-referential collinear holographic memory and spatial quadrature amplitude modulation　　　　　　　　　　　　　　　
Atsushi Okamoto, Keisuke Zukeran, Atsushi Shibukawa, Masanori Takabayashi
Optics InfoBase Conference Papers, Optical Society of American (OSA), 2011年
英語, 研究論文（国際会議プロシーディングス）, A double-referential method, in which the reference light necessary for phase detection can be generated as diffraction light of the optical hologram automatically, is newly proposed. 16-SQAM signals can be reconstructed through dual-stage holography. © 2011 Optical Society of America.

体積ホログラムの高速数値解析手法を応用した新しい3次元ディスプレイの基本動作シミュレーション (画像工学)
舟越 久敏, 岡本 淳, 渋川 敦史, 電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 115, 459, 309, 313, 2016年02月22日
電子情報通信学会, 日本語

Highly accurate spatial mode generation using spatial cross modulation method for mode division multiplexing
Hiroki Sakuma, Atsushi Okamoto, Atsushi Shibukawa, Yuta Goto, Akihisa Tomita, Next-Generation Optical Communication: Components, Sub-Systems, and Systems V, 2016年02月13日
SPIE

High-resolution and simultaneous measurement along the depth direction using virtual phase conjugation for optical tomography
Yuta Goto, Atsushi Okamoto, Atsushi Shibukawa, Akihisa Tomita, Masanori Takabayashi, 2015 20th Microoptics Conference (MOC), 2015年10月
IEEE

Optical tomography using a random diffuser and digital phase conjugation
Yuta Goto, Atsushi Okamoto, Atsushi Shibukawa, Akihisa Tomita, Kunihiro Sato, Optical Tomography and Spectroscopy of Tissue XI, 2015年03月05日
SPIE

仮想位相共役技術を用いた光断層イメージングの特性解析 (画像工学)
後藤 優太, 岡本 淳, 渋川 敦史, 電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 114, 460, 9, 14, 2015年02月23日
電子情報通信学会, 日本語

仮想位相共役技術を用いた光断層イメージングの特性解析 (ITS)
後藤 優太, 岡本 淳, 渋川 敦史, 電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 114, 459, 9, 14, 2015年02月23日
電子情報通信学会, 日本語

3次元表示に向けた空間クロスモジュレーション法
菅悠太, 岡本淳, 渋川敦史, 富田章久, 舟越久敏, 応用物理学会秋季学術講演会講演予稿集(CD-ROM), 75th, 2014年

2重参照型ホログラフィックメモリにおける38値空間直交振幅変調信号の記録再生
瑞慶覽 圭佑, 岡本 淳, 高林 正典, 渋川 敦史, 富田 章久, 映像情報メディア学会技術報告, 37, 10, 1, 7, 2013年02月15日
再生時に干渉用の光波を生成・照射する機構を必要とせずに,参照光の照射のみで位相変調信号を復調できる新たなホログラフィックメモリとして2重参照型ホログラフィックメモリ(DRHM)を提案する.本技術では小型かつ正確な再生光の複素振幅検出によって,多値数の大きな位相変調信号や空間直交振幅変調(SQAM)信号の使用が可能になり,ホログラフィックメモリの大幅な高密度化,高速化が期待できる.本論文では,DRHMの基本原理を示すと共に,同技術による38値SQAM信号の記録再生シミュレーションを行う.さらに,DRHMの再生品質を高めることができる手法を新たに提案し,DRHMの再生エラーが大幅に低減されることを示す., 一般社団法人映像情報メディア学会, 日本語

Wavefront shaping-assisted subcellular-resolution focus scanning over centimeter-scale field-of-view　　　　　　　　　　　　　　　
Atsushi Shibukawa
The 13th Asia-Pacific Laser Symposium 2025, 2025年05月16日, 英語, 口頭発表（招待・特別）
2025年05月12日 - 2025年05月17日, ［招待講演］

Wavefront shaping-assisted multi-regional two-photon microscopy for recording distributed neuronal activity across the mouse cortex　　　　　　　　　　　　　　　
Hyojeong Shon, Atsushi Shibukawa, Hideharu Mikami
Focus on microscopy 2025, 2025年04月15日, 英語, ポスター発表

Ultra-wide field-of-view optical focus control with high-speed complex wavefront shaping　　　　　　　　　　　　　　　
Atsushi Shibukawa
The 85th JSAP Autumn Meeting 2024, 2024年09月, 英語, 口頭発表（招待・特別）
2024年09月16日 - 2024年09月20日, ［招待講演］

Wavefront shaping at 10 MHz refresh rate by exploiting the scan speed of a resonant scanner　　　　　　　　　　　　　　　
Atsushi Shibukawa, Yuki Sudo, Hideharu Mikami, Mooseok Jang
The Pacific Rim Conference on Lasers and Electro-Optics (CLEO-PR) 2024, 2024年08月, 英語, 口頭発表（招待・特別）
［招待講演］

超高速1D空間光変調を基盤とする散乱レンズによる 10MHzランダムアクセス集光走査　　　　　　　　　　　　　　　
渋川敦史, 須藤雄気, 三上秀治, ジャングムサク
日本光学会年次学術講演会, 2023年11月28日, 日本語, シンポジウム・ワークショップパネル（指名）
2023年11月27日 - 2023年11月29日, ［招待講演］

マウス脳皮質の全域イメージングに向けたコンプレックス波面補償による超広視野集光レンズの開発　　　　　　　　　　　　　　　
渋川敦史, 孫孝政, 三上秀治
日本光学会年次学術講演会, 2023年11月27日, 日本語, ポスター発表
2023年11月27日 - 2023年11月29日

LED光源を用いたアーキロドプシン3（AR3）による長時間膜電位計測法の確立　　　　　　　　　　　　　　　
川西 志歩, 小島 慧一, 渋川 敦史, 坂本 雅行, 須藤 雄気
第43回生体膜と薬物の相互作用シンポジウム, 2022年10月07日, 英語

LED光源を用いた微生物型ロドプシンAR3による膜電位の長時間イメージング　　　　　　　　　　　　　　　
川西 志歩, 小島 慧一, 渋川 敦史, 坂本 雅行, 須藤 雄気
第60回日本生物物理学会年会, 2022年09月29日, 英語, ポスター発表

Megahertz Wavefront Control through Scattering Media　　　　　　　　　　　　　　　
Atsushi Shibukawa, Hideharu Mikami, Mooseok Jang, Yuki Sudo
The 22nd RIES-Hokudai International Symposium, 2021年12月06日, 英語, ポスター発表

コンプレックス波面整形による光散乱との共生　　　　　　　　　　　　　　　
渋川敦史
コニカミノルタカレッジ「先端光学」, 2021年12月02日, 日本語, 公開講演，セミナー，チュートリアル，講習，講義等
［招待講演］

Ultrafast wavefront control involving scattering media　　　　　　　　　　　　　　　
Atsushi Shibukawa, Jang Mooseok, Hideharu Mikami, Yuki Sudo
International Symposium on Imaging, Sensing, and Optical Memory 2021, 2021年10月04日, 英語, 口頭発表（招待・特別）
［招待講演］

LED光源を用いたアーキロドプシン3由来の膜電位感受性蛍光の観察　　　　　　　　　　　　　　　
川西志歩, 小島慧一, 渋川敦史, 坂本雅行, 須藤雄気
第12回日本生物物理学会 中国四国支部大会, 2021年05月22日, 日本語, ポスター発表