Faculty Profiles - SAITA Yusuke

Published Papers - SAITA Yusuke

Division display >> ／ All the affair displays1 - 35 of about 35

Single-shot Compressive Hyperspectral Imaging Utilizing Both Positive and Negative Diffracted Waves

Yusuke Saita, Ryohei Takahashi, Takanori Nomura （Part： Lead author,　Corresponding author )

Advanced Devices & Instrumentation ( American Association for the Advancement of Science (AAAS) ) 6 0080 2025.03 [Refereed]

DOI

Random sparse sampling and compressive sensing based reconstruction for computational optical scanning holography

Naru Yoneda, Masamitsu Sugimoto, Yusuke Saita, Osamu Matoba, Takanori Nomura

Applied Optics 64 ( 7 ) B102 - 108 2025.03 [Refereed]

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Orthogonal matrix of polarization combinations: concept and application to multichannel holographic recording

Shujun Zheng, Jiaren Tan, Hongjie Liu, Xiao Lin, Yusuke Saita, Takanori Nomura, Xiaodi Tan

Opto-Electronic Advances ( Opto-Electronic Advances ) 7 ( 10 ) 230180 - 230180 2024.10 [Refereed]

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Adaptive sampling strategy for Fourier single-pixel imaging

Hongjie Liu, Yuki Matsuda, Shujun Zheng, Yusuke Saita, Xiao Lin, Takanori Nomura, Xiaodi Tan

Optics Communications ( Elsevier BV ) 573 131027 - 131027 2024.08 [Refereed]

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Computational Optical Scanning Holography

Naru Yoneda, Jung-Ping Liu, Osamu Matoba, Yusuke Saita, Takanori Nomura

Photonics ( MDPI AG ) 11 ( 4 ) 347 - 347 2024.04 [Refereed]

Holographic techniques are indispensable tools for modern optical engineering. Over the past two decades, research about incoherent digital holography has continued to attract attention. Optical scanning holography (OSH) can obtain incoherent holograms using single-pixel detection and structured illumination with Fresnel zone patterns (FZPs). Particularly by changing the size of a detector, OSH can also obtain holograms under coherently illuminated conditions. Since 1979, OSH has continuously evolved. According to the evolution of semiconductor technology, spatial light modulators (SLMs) come to be useful for various imaging fields. By using SLM techniques for OSH, the practicality of OSH is improved. These SLM-based OSH methods are termed computational OSH (COSH). In this review, the configurations, recording and reconstruction methods, and proposed applications of COSH are reviewed.

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Quantitative phase imaging based on motionless optical scanning holography

Naru Yoneda, Osamu Matoba, Yusuke Saita, Takanori Nomura

Optics Letters ( Optica Publishing Group ) 48 ( 20 ) 5273 - 5273 2023.10 [Refereed]

Optical scanning holography (OSH) can be applied to 3D fluorescent imaging. However, the optical setup for OSH is complicated due to the requirement of a phase shifter, a 2D mechanical scanner, and an interferometer. Although motionless optical scanning holography (MOSH) can overcome the problem, quantitative phase imaging (QPI) has not yet been realized because MOSH can only obtain incoherent holograms. If QPI in MOSH is realized, MOSH can be applied to various applications. In this Letter, MOSH-based QPI (MOSH-QPI) is proposed. In addition, a simple description of a coherent mode of OSH is presented. In the proof-of-principle experiment, the spatially divided phase-shifting technique is applied to reduce the number of measurements. The feasibility of MOSH-QPI is confirmed by measuring a phase distribution of a microlens array. MOSH-QPI is also applied to measure practical samples, and its results are compared with the experimental results of the conventional one using a Mach–Zehnder interferometer.

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Polarization imaging by use of optical scanning holography

Naru Yoneda, Yusuke Saita, Takanori Nomura

Optical Review ( Springer Science and Business Media LLC ) 30 26 - 32 2023 [Refereed]

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Common-path off-axis single-pixel holographic imaging

Naru Yoneda, Yusuke Saita, Takanori Nomura

Optics Express ( Optica Publishing Group ) 30 ( 11 ) 18134 - 18134 2022.05 [Refereed]

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Enhanced Recording Density via Multilevel Phase Retrieval and Correlation-based Multiplexed Recording in Computer-generated Holographic Data Storage

Yusuke Saita, Naru Yoneda, Aoto Matsumoto, Takanori Nomura （Part： Lead author,　Corresponding author )

ITE Transactions on Media Technology and Applications ( Institute of Image Information and Television Engineers ) 10 ( 2 ) 69 - 74 2022.04 [Refereed] [Invited]

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Single-shot compressive hyperspectral imaging with dispersed and undispersed light using a generally available grating

Yusuke Saita, Daiki Shimoyama, Ryohei Takahashi, Takanori Nomura （Part： Lead author,　Corresponding author )

Applied Optics ( The Optical Society ) 61 ( 5 ) 1106 - 1106 2022.02 [Refereed]

DOI

Three-dimensional fluorescence imaging through dynamic scattering media by motionless optical scanning holography

Naru Yoneda, Yusuke Saita, Takanori Nomura

Applied Physics Letters ( AIP Publishing ) 119 ( 16 ) 161101 - 161101 2021.10 [Refereed]

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Single-shot higher-order transport-of-intensity quantitative phase imaging using deep learning

Naru Yoneda, Shunsuke Kakei, Koshi Komuro, Aoi Onishi, Yusuke Saita, Takanori Nomura

Applied Optics ( The Optical Society ) 60 ( 28 ) 8802 - 8802 2021.10 [Refereed]

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Common-path angular-multiplexing holographic data storage based on computer-generated holography

Naru Yoneda, Teruyoshi Nobukawa, Toshiyuki Morimoto, Yusuke Saita, Takanori Nomura

Optics Letters ( The Optical Society ) 46 ( 12 ) 2920 - 2920 2021.06 [Refereed]

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Single-shot higher-order transport-of-intensity quantitative phase imaging based on computer-generated holography

Naru Yoneda, Aoi Onishi, Yusuke Saita, Koshi Komuro, Takanori Nomura

Opt. Express ( OPTICAL SOC AMER ) 29 ( 4 ) 4783 - 4801 2021.02 [Refereed]

The imaging quality of quantitative phase imaging (QPI) based on the transport of intensity equation (TIE) can be improved using a higher-order approximation for defocused intensity distributions. However, this requires mechanically scanning an image sensor or object along the optical axis, which in turn requires a precisely aligned optical setup. To overcome this problem, a computer-generated hologram (CGH) technique is introduced to TIE-based QPI. A CGH generating defocused point spread function is inserted in the Fourier plane of an object. The CGH acts as a lens and grating with various focal lengths and orientations, allowing multiple defocused intensity distributions to be simultaneously detected on an image sensor plane. The results of a numerical simulation and optical experiment demonstrated the feasibility of the proposed method. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

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Spatially divided phase-shifting motionless optical scanning holography

Naru Yoneda, Yusuke Saita, Takanori Nomura

OSA Continuum ( OPTICAL SOC AMER ) 3 ( 12 ) 3523 - 3535 2020.12 [Refereed]

Motionless optical scanning holography (MOSH) has been proposed for three-dimensional incoherent imaging in single-pixel holography with a simple optical setup. To reduce the measurement time in MOSH, a spatially divided phase-shifting technique is introduced. The proposed method realizes measurements four times faster than the original MOSH, owing to the simultaneous lateral and phase shifts of a time-varying Fresnel zone plate. A hologram reproduced by the proposed method forms a spatially multiplexed phase-shifting hologram similar to parallel phase-shifting digital holography. The effectiveness of the proposed method is numerically and experimentally verified. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

DOI

Multiplexed recording based on the reference wave correlation for computer-generated holographic data storage

Yusuke Saita, Aoto Matsumoto, Naru Yoneda, Takanori Nomura （Part： Lead author )

Optical Review ( Springer Science and Business Media {LLC} ) 27 ( 4 ) 391 - 398 2020.08 [Refereed]

DOI

Motionless optical scanning holography

Naru Yoneda, Yusuke Saita, Takanori Nomura

Opt. Lett. ( OPTICAL SOC AMER ) 45 ( 12 ) 3184 - 3187 2020.06 [Refereed]

Optical scanning holography (OSH) is an attractive technique since 3D information can be obtained with a single pixel detector. However, OSH requires an interferometer, scanning architecture, and a frequency shifter to scan a time-varying Fresnel zone plate (FZP), which makes the optical setup complicated. To reduce the complexity, the polarization sensitivity of a spatial light modulator (SLM) is applied. The proposed method implements a time-varying FZP with an in-line optical setup by using only an SLM. Observing results for a USAF pattern and a fluorescent bead reveals the feasibility of the new motionless holographic 3D imaging technique. (C) 2020 Optical Society of America

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Computer-generated-hologram-based holographic data storage using common-path off-axis digital holography

Naru Yoneda, Yusuke Saita, Takanori Nomura

Opt. Lett. ( OPTICAL SOC AMER ) 45 ( 10 ) 2796 - 2799 2020.05 [Refereed]

A reconstruction method for multilevel complex encoded data-pages is proposed to increase the recording density of computer-generated-hologram-based holographic data storage by using off-axis digital holography. Although the detection process is based on off-axis digital holography, the proposed method keeps the optical setup a simple and common-path configuration owing to the computer-generated holography. Five-level complex encoded data-pages can be experimentally reconstructed. (C) 2020 Optical Society of America

DOI

Transport of intensity phase imaging under a low signal-to-noise ratio condition

Takanori Nomura, Koshi Komuro, Shunsuke Kakei, Naru Yoneda, Yusuke Saita

Proceedings of SPIE - The International Society for Optical Engineering 11548 2020

Two phase imaging methods with transport of intensity equation (TIE) under a low signal to noise ratio (SNR) are introduced. One is a TIE phase imaging with deep learning. It is useful for parallel TIE using a diffractive optics to produce defocus images simultaneously. The defocus images are obtained by an optical convolution integral by the calculated blurred point spread functions. However the point spread functions are different from the ideals due to the limited extent and/or limited resolution of the diffractive optics. This means that an SNR of the through-focus images is low. Therefore, deep learning compensates the error. Another is transport-of-intensity computational ghost imaging (TI-CGI). It is a combination of TIE and a computational ghost imaging (CGI). It is useful for noninvasive imaging for the biomedical field because most cells are photo-sensitive and often suffer from phototoxicity. However, CGI can obtain only amplitude information. In the biomedical field, a phase information is important to know the physical parameters. To achieve, under weak illumination, it is difficult to obtain through-focus images with high SNRs. Therefore, combination of TIE and CGI is useful.

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Numerical evaluation of transport-of-intensity phase imaging with oblique illumination for refractive index tomography

Koshi Komuro, Yusuke Saita, Yosuke Tamada, Takanori Nomura

Proceedings Digital Holography and Three-Dimensional Imaging 2019 2019.05

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Binary computer-generated-hologram-based holographic data storage

Naru Yoneda, Yusuke Saita, Takanori Nomura

Applied Optics ( OPTICAL SOC AMER ) 58 ( 12 ) 3083 - 3090 2019.04 [Refereed]

Conventional computer-generated-hologram-based holographic data storage (CGH-HDS) needs to use a multilevel modulatable spatial light modulator (SLM). A binary SLM usually has a higher refresh rate than a multilevel one, and it enables HDS to increase the data transfer rate. To increase the data transfer rate by using a binary SLM, the introduction of a binary CGH is proposed. In general, a binary CGH degrades the image quality of reconstructed intensity distribution and emphasizes high spatial frequency components of datapages. In the proposed method, reconstructed intensity distributions that satisfy image quality as datapages can be obtained with low-pass filtering with an aperture at a plane of a recording medium. The optimum size of an aperture is numerically evaluated. The proposed method is experimentally verified. Moreover, the proposed method can achieve single and multiplexed recording of three datapages by a spherical reference beam with a binary CGH. (C) 2019 Optical Society of America

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Transport-of-intensity holographic data storage based on a computer-generated hologram

Naru Yoneda, Yusuke Saita, Koshi Komuro, Teruyoshi Nobukawa, Takanori Nomura

Applied Optics ( OPTICAL SOC AMER ) 57 ( 30 ) 8836 - 8840 2018.10 [Refereed]

To increase the recording density of computer-generated-hologram (CGH)-based holographic data storage, a phase data page reconstruction method by the transport of intensity equation (TIE) is proposed. The TIE generally requires a scanning image sensor because the phase retrieval process needs at least two defocused intensity distributions. Although the TIE is applied, the proposed method enables detection of the distributions simultaneously by utilizing an extra conjugate component reconstructed from the CGH. Experimental results show that the proposed method allows reconstructing of a phase data page without any additional elements, which keeps the optical setup simple and low cost. (C) 2018 Optical Society of America

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Three-dimensional shift multiplexed recording in coaxial holographic data storage with virtual varifocal lens

Yusuke Saita, Masahiro Karaike, Takanori Nomura

Optics InfoBase Conference Papers ( OSA - The Optical Society ) 2018 2018

Holographic data storage (HDS) is one of attractive solutions for archiving huge number of data produced all over the world. A coaxial system in HDS has some advantages of simple setup, tolerance to vibrations, and so on. In a coaxial system, the two-dimensional (2D) shift multiplexing is achieved by lateral medium shifts corresponding to disk rotation. Also, the multi-layer recording with a kinoform varifocal lens has also been proposed, which is based on adding a defocus phase distribution to signal and reference patterns displayed on a spatial light modulator (SLM) [1]. In this paper, we propose the three-dimensional (3D) shift multiplexing combining these multiplexed schemes and the criteria to determine the appropriate recording condition. The proposed method confirms the feasibility of improving the recoring density in coaxial HDS.

Computer-generated-hologram-based holographic data storage using a transport of intensity equation

Naru Yoneda, Yusuke Saita, Koshi Komuro, Teruyoshi Nobukawa, Takanori Nomura

Optics InfoBase Conference Papers Part F125-OPJ 2018 2018

Utilization of phase information can increase the recording density of holographic data storage. In this paper, a transport of intensity equation is introduced to computer-generated-hologram-based holographic data storage, which can obtain the phase datapage while keeping an optical setup simple and compact. Moreover, two defocused intensity distributions for the transport of intensity equation can be simultaneously obtained by using a conjugate beam from the computer-generated hologram.

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Large dynamic range wavefront sensing using Shack-Hartmann wavefront sensor based on pattern correlations

Saita, Yusuke, Nomura, Takanori

OPTICAL DESIGN AND TESTING VIII ( SPIE-INT SOC OPTICAL ENGINEERING ) 10815 2018 [Refereed]

Wavefront sensing techniques are mainly needed in an adaptive optics system for high resolution imaging. One of them is a Shack-Hartmann method which is composed of very simple structure. Although the method is widely utilized, it also has the limitation for the measurable magnitude of wavefront aberrations. To overcome the problem, the improved Shack-Hartmann method for larger aberrated wavefronts has been proposed. In this paper, the principle of the proposed method and the numerical evaluation of the performance of the proposed method are presented.

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Effects of Microdot Lens on Visual Acuity and Contrast Sensitivity

井手武, 塩谷俊介, 久松良輔, 大林知央, 神田寛行, 伊東一良, 野村孝徳, 最田裕介, 戸田郁子, 坪田一男, 不二門尚

あたらしい眼科 ( メディカル葵出版 ) 33 ( 9 ) 1376 - 1380 2016.09 [Refereed]

Shack-Hartmann wavefront sensor with large dynamic range by adaptive spot search method

Hironobu Shinto, Yusuke Saita, Takanori Nomura

APPLIED OPTICS ( OPTICAL SOC AMER ) 55 ( 20 ) 5413 - 5418 2016.07 [Refereed]

A Shack-Hartmann wavefront sensor (SHWFS) that consists of a microlens array and an image sensor has been used to measure the wavefront aberrations of human eyes. However, a conventional SHWFS has finite dynamic range depending on the diameter of the each microlens. The dynamic range cannot be easily expanded without a decrease of the spatial resolution. In this study, an adaptive spot search method to expand the dynamic range of an SHWFS is proposed. In the proposed method, spots are searched with the help of their approximate displacements measured with low spatial resolution and large dynamic range. By the proposed method, a wavefront can be correctly measured even if the spot is beyond the detection area. The adaptive spot search method is realized by using the special microlens array that generates both spots and discriminable patterns. The proposed method enables expanding the dynamic range of an SHWFS with a single shot and short processing time. The performance of the proposed method is compared with that of a conventional SHWFS by optical experiments. Furthermore, the dynamic range of the proposed method is quantitatively evaluated by numerical simulations. (C) 2016 Optical Society of America

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Improvement of Image Quality of 3D Display by Using Optimized Binary Phase Modulation and Intensity Accumulation

Kazunobu Masuda, Yusuke Saita, Ryusuke Toritani, Peng Xia, Kouichi Nitta, Osamu Matoba

JOURNAL OF DISPLAY TECHNOLOGY ( IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC ) 12 ( 5 ) 472 - 477 2016.05 [Refereed]

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Improvement of image quality of three-dimensional display using a binary phase distribution

Kazunobu Masuda, Yusuke Saita, Ryusuke Toritani, Peng Xia, Kouichi Nitta, Osamu Matoba

Proceedings of the International Display Workshops ( International Display Workshops ) 2 1230 - 1233 2015

Expansion of dynamic range in Shack-Hartmann wavefront sensor using dual microlens array

Hironobu Shinto, Yusuke Saita, Takanori Nomura

BIOPHOTONICS JAPAN 2015 ( SPIE-INT SOC OPTICAL ENGINEERING ) 9792 2015 [Refereed]

A Shack-Hartmann wavefront sensor (SHWFS) which consists of a microlens array and an image sensor has been used to measure the wavefront aberrations in various fields owing to its advantages such as simple configuration. However, a conventional SHWFS has the finite dynamic range. The dynamic range cannot be expanded without sacrificing the spatial resolution and the sensitivity in a conventional SHWFS. In this study, the SHWFS using a dual microlens array to solve the problem is proposed. In the proposed method, an astigmatic microlens is arranged at the center of a group of 2 x 2 spherical microlenses. A pattern image including spots and linear patterns is obtained at the focal plane by the dual microlens array. The pattern image can be separated into two images as if two microlens array with different diameter were used by discriminating spots from linear patterns with the pattern matching technique. The proposed method enables to expand the dynamic range of an SHWFS by using the separated two images. The performance of the proposed method is confirmed by the numerical simulation for measuring a spherical wave.

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Wavefront Measurement with Large Dynamic Range Using Holographic Shack-Hartmann Wavefront Sensor

Yusuke Saita, Hironobu Shinto, Takanori Nomura

2015 14TH WORKSHOP ON INFORMATION OPTICS (WIO) ( IEEE ) 2015 [Refereed]

Expansion of dynamic range in Shack-Hartmann wavefront sensor using dual microlens array

Hironobu Shinto, Yusuke Saita, Takanori Nomura

Progress in Biomedical Optics and Imaging - Proceedings of SPIE ( SPIE ) 9792 2015 [Refereed]

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Holographic Shack–Hartmann wavefront sensor based on the correlation peak displacement detection method for wavefront sensing with large dynamic range

Yusuke Saita, Hironobu Shinto, Takanori Nomura （Part： Lead author,　Corresponding author )

Optica ( OSA - The Optical Society ) 2 ( 5 ) 411 - 415 2015 [Refereed]

A method to expand the dynamic range for a Shack–Hartmann wavefront sensor (SHWFS) is proposed. An SHWFS consists of a microlens array and an image sensor, and it has been widely used to measure the wavefront aberration of a lightwave in various fields. However, a very large aberrated wave cannot be correctly measured due to the finite dynamic range that depends on the diameter of each microlens. The proposed method enables an SHWFS to measure wavefronts with larger aberrations by applying holography and pattern matching technologies. For measurement of a spherical wave, the proposed method is compared with a conventional one by numerical simulations and optical experiments. Their results confirm the performance of the proposed method.

DOI

Design method of input phase mask to improve light use efficiency and reconstructed image quality for holographic memory

Yusuke Saita, Takanori Nomura （Part： Lead author,　Corresponding author )

Applied Optics 53 ( 19 ) 4136 - 4140 2014.06 [Refereed]

Design of reference pattern and input phase mask for coaxial holographic memory

Yusuke Saita, Takanori Nomura, Eiji Nitanai, Takuhisa Numata （Part： Lead author )

Japanese Journal of Applied Physics 50 ( 9 ) 09ME03 2011.09 [Refereed]

Design methods of a reference pattern and an input phase mask for a coaxial holographic memory are described. By the proposed method, it is expected that the useless consumption of the dynamic range of a recording medium will decrease, and the light efficiency and the interference efficiency between the signal beam and the reference beam will be improved. A reference pattern and an input phase mask are designed by a simulated annealing. The performance of the proposed design method is confirmed by numerical simulations and optical experiments. Furthermore, the holographic memory system using both the designed reference pattern and the designed input phase mask is also confirmed by numerical simulations and optical experiments. © 2011 The Japan Society of Applied Physics.

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Published Papers - SAITA Yusuke