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Investigation of free space optical communication using spectrum slicing under different weather condition Opt. Rev. (IF 1.047) Pub Date : 2022-08-05 Ekta Vasani, Vrushank Shah
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Performance comparisons between inverted and conventional avalanche photodiodes for larger capacity applications Opt. Rev. (IF 1.047) Pub Date : 2022-07-22 Zhuodong Liao, Ke Li, Haoran Liu, Xiaofeng Duan, Yongqing Huang, Kai Liu
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Spectral transmittance and luminance factor of the binocular separation glasses for stereotests using random-dot stereograms Opt. Rev. (IF 1.047) Pub Date : 2022-07-21 Shunya Tatara, Osamu Masuda, Fumiatsu Maeda
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Depth estimation of protoporphyrin IX objects in turbid media considering the fluorescence intensity ratio between two wavelengths of light for application in invasion diagnosis of gastric cancer Opt. Rev. (IF 1.047) Pub Date : 2022-07-21 Hinano Imanishi, Takahiro Nishimura, Kunio Awazu
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A three-dimensional measurement method for colorful objects based on intensity pre-calibration Opt. Rev. (IF 1.047) Pub Date : 2022-07-02 Qian Zhu, Hong Zhao, Zixuan Gong
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Full-parallax three-dimensional display based on light field reproduction Opt. Rev. (IF 1.047) Pub Date : 2022-07-02 Hayato Watanabe, Takuya Omura, Naoto Okaichi, Masanori Kano, Hisayuki Sasaki, Jun Arai
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Smart inverters with broadband light absorption enhancement of nanostructure plasmonic solar absorber using PSO algorithms and FDTD method Opt. Rev. (IF 1.047) Pub Date : 2022-06-29 Ali Farmani, Abdolsamad Hamidi
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Dorsal hand vein recognition based on transmission-type near infrared imaging and deep residual network with attention mechanism Opt. Rev. (IF 1.047) Pub Date : 2022-06-28 Zhenghua Shu, Zhihua Xie, Chuncheng Zhang
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Generating and converting special focal field patterns in a 4Pi focusing system illuminated by azimuthally polarized vortex beam Opt. Rev. (IF 1.047) Pub Date : 2022-06-25 Yanfang Yang, Xiyu Yan, Ying He, Huihui Duan, LuLu Li
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Demodulation scheme for constant-weight codes using convolutional neural network in holographic data storage Opt. Rev. (IF 1.047) Pub Date : 2022-06-17 Shinya Kurokawa, Shuhei Yoshida
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First-principles study of InxGa1-xAs1-yPy with different compositions Opt. Rev. (IF 1.047) Pub Date : 2022-06-16 Yong Wang, Jianxin Li, Junju Zhang, Weiwei Sha, Weipeng Zhang, Yujie Du
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Theoretical and experimental guideline of optimum design of defect-inspection apparatus for transparent material using phase-shift illumination approach Opt. Rev. (IF 1.047) Pub Date : 2022-06-13 Yoshito Onishi, Yoshiho Seo, Masaoki Matsuoka, Shigeru Serikawa, Ken Tsugane
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Efficient waveguide-type four-color (red–green–blue–infrared) laser beam combiner for compact laser beam scanning image projectors Opt. Rev. (IF 1.047) Pub Date : 2022-06-10 Akira Nakao, Shoji Yamada, Toshio Katsuyama
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Effect of the cut ratio of selective yellow-cut lenses on contrast sensitivity Opt. Rev. (IF 1.047) Pub Date : 2022-05-17 Tomoya Handa, Shuji Nakatsuka, Hirotaka Ito
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Design method of soft X-ray and vacuum ultraviolet optical system based on plane-symmetric aberration theory Opt. Rev. (IF 1.047) Pub Date : 2022-05-17 Yiqing Cao
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Scattering imaging of biomolecules with metallic nanoparticles: localization precision, imaging speed, and multicolor imaging capability Opt. Rev. (IF 1.047) Pub Date : 2022-05-16 Jun Ando
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A theory of reflection and refraction of light by a metal Opt. Rev. (IF 1.047) Pub Date : 2022-05-12 Koichi Katsumata
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Thermal properties of AlN–Ce:YAG composite ceramic phosphor for laser lighting Opt. Rev. (IF 1.047) Pub Date : 2022-05-05 Takuya Sawada, Hiroshi Fuji, Kenta Yagasaki, Kana Fujioka, Hisashi Minemoto, Kazuhisa Yamamoto
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A novel fast 3D measurement method based on phase-coded fringe projection Opt. Rev. (IF 1.047) Pub Date : 2022-05-03 Tian Shiyang, Fu Yanjun, Gui Jiannan, Ma Baiheng, Yan Zhanjun
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Precise retinal shape measurement by alignment error and eye model calibration Opt. Rev. (IF 1.047) Pub Date : 2022-04-29 Kseniya Palchunova, Toshihiro Mino, Toshifumi Mihashi, Jonathan Liu, Kuniharu Tasaki, Yumi Hasegawa, Takahiro Hiraoka, Tetsuro Oshika
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Improving resolution of lensless imaging with higher harmonics of Fresnel zone aperture Opt. Rev. (IF 1.047) Pub Date : 2022-04-28 Kazuyuki Tajima, Yusuke Nakamura, Keita Yamaguchi, Takeshi Shimano
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Extraction information of moiré fringes based on Gabor wavelet Opt. Rev. (IF 1.047) Pub Date : 2022-04-28 Ya-yi Chen, Yun-yun Chen, Wei-hao Cheng, Meng Xu, Jun-yan Zhuang
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Facial expression recognition based on anomaly feature Opt. Rev. (IF 1.047) Pub Date : 2022-04-18 Kan Hong
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Experimental study on frequency doubling of Q-switched partially coherent laser Opt. Rev. (IF 1.047) Pub Date : 2022-04-04 Kaiyuan Wang, Yushuang Wang, Guowen Zhang, Ziyang Chen, Jixiong Pu
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Distributed feedback fiber laser-based broadband air acoustic sensor using PI film and PEEK shell structure Opt. Rev. (IF 1.047) Pub Date : 2022-03-28 Ying-Ying Wang, Chang Wang, Shi-Wei Zhao, Fa-Xiang Zhang, Shu-Juan Li, Xiao-Mei Ma
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The 12th International Conference on Optics-Photonics Design & Fabrication (ODF'20 in 2021), Taoyuan, Taiwan. Opt. Rev. (IF 1.047) Pub Date : 2022-03-25 Kenji Konno
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Simulation of mid-air images using combination of physically based rendering and image processing Opt. Rev. (IF 1.047) Pub Date : 2022-03-14 Ayami Hoshi, Shunji Kiuchi, Naoya Koizumi
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Batch skeleton extraction from ESPI fringe patterns using pix2pix conditional generative adversarial network Opt. Rev. (IF 1.047) Pub Date : 2022-03-10 Huaying Wang, Zijian Zhang, Qiaofen Zhu, Xue Wang, Zhao Dong, Gaofu Men, Jieyu Wang, Jialiang Lei, Wenjian Wang
The key to measurement by electronic speckle pattern interferometry (ESPI) is to obtain accurate phase information from the ESPI fringe patterns. We propose a fast batch skeleton extraction method for ESPI fringe patterns using the pix2pix conditional generative adversarial network (pix2pix cGAN). The network is trained by ESPI fringe patterns and complete skeleton images, and the trained network can
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A single backlit image enhancement method by image fusion with a weight map for improvement of dark area’s visibility Opt. Rev. (IF 1.047) Pub Date : 2022-03-07 Masato Akai, Yoshiaki Ueda, Takanori Koga, Noriaki Suetake
Images captured in backlit conditions (i.e., backlit images) often have a vast difference in lightness between bright and dark areas. In such a dark area in an image, the visibility becomes extremely low, making it indistinct to recognize the subject. Sufficient image quality cannot be obtained by simply applying a general image enhancement method to such a backlit image. Many methods specializing
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Multispectral image sensor attachable to low-cost microcomputers Opt. Rev. (IF 1.047) Pub Date : 2022-03-01 Yasuo Ohtera, Airi Sato, Takayuki Kawashima, Tomohisa Takaya, Yuki Okura
Multi-spectral filter array composed of a wavy alternating dielectric multilayer was integrated on a CMOS image sensor of the Raspberry Pi HQ Camera. The filter array consists of 16-channel elementary filters exhibiting pseudo-random transmission characteristics. Each filter covers \(20\times 20\) CMOS pixels. The incoming spectrum is encoded as a set of 16 grayscale intensities and passed to principal
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Tunable comb-like optical transmission spectrum resulting from equilateral polygonal networks Opt. Rev. (IF 1.047) Pub Date : 2022-02-18 Xiaohui Xu, Yu Wang, Jiamin Ye
The photonic band structures of waves in configuration-periodic equilateral polygonal networks (EPNs) are studied in the paper. The results indicate that comb-like optical transmission spectrum can be realized by EPNs.The number, width, and range of continuous equidistant frequency bands can be controlled conveniently by adjusting the waveguide length and the unit cell numbers of upper arm. Those comb-like
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Research on three-core photonic crystal fiber plasmonic sensor based on surface plasmon resonance with three V-groove microfluidic channel Opt. Rev. (IF 1.047) Pub Date : 2022-02-16 Shengxi Jiao, Xinzhi Li, Xiaolei Ren, Hanrui Yang, Shibo Xu
A three-core photonic crystal fiber (PCF) sensor based on surface plasmon resonance (SPR) has been designed with silver film coated on the inner wall of a microfluidic detection channel with three V-grooves. The coupling characteristics and sensing properties of the proposed sensor are analyzed numerically using the full vector finite element method (FEM). The loss spectra and the sensing performance
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Improvement of the distortion of aerial displays and proposal for utilizing distortion to emulate three-dimensional aerial image Opt. Rev. (IF 1.047) Pub Date : 2022-02-03 Kosuke Inoue, Masaki Yasugi, Hirotsugu Yamamoto, Nao Ninomiya
This paper evaluates the spatial distortion of aerial image and proposes a novel optical design to utilize the distortion as visual expression. Our optical system is based on aerial imaging by retro-reflection (AIRR). Using acrylic plate as beam splitter, a clear aerial image can be obtained at low cost. However, when upsizing the device, there is a problem that aerial image was distorted because the
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Improvement of color rendering index of BGYR laser illuminants Opt. Rev. (IF 1.047) Pub Date : 2022-02-03 Yoshio Manabe, Masato Ishino, Hiroshi Fuji, Junichi Kinoshita, Kana Fujioka, Kazuhisa Yamamoto
Laser-driven phosphor conversion (PC)-type white light sources are receiving a great deal of attention in next-generation high-intensity lighting and display technologies. Laser lighting is attracting attention for its functions, such as energy saving and light distribution control. However, the PC-type white light source has problems with color control and thermal quenching. Thus, monochromatic light
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Vibration discrimination based upon multifractal spectrum and improved probabilistic neural network in the dual Mach–Zehnder interferometric perimeter system Opt. Rev. (IF 1.047) Pub Date : 2022-01-30 Meng Li, Jiaxin Li, Xinglong Xiong, Yifei Zhao, Yuzhao Ma
For improving the performance of vibration discrimination in terms of dual Mach–Zehnder interferometric (DMZI) perimeter system, we proposed a novel method based upon the multifractal theory, serial feature fusion as well as improved probabilistic neural network (PNN). By the multifractal theory, the features of original signal are extracted in the form of multifractal spectrum parameters, thereby
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Improvement of apparent resolution by subjective super-resolution display for aerial display using AIRR Opt. Rev. (IF 1.047) Pub Date : 2022-01-29 Kojiro Matsushita, Masaki Yasugi, Akinori Tsuji, Toyotaro Tokimoto, Hirotsugu Yamamoto
AIRR (Aerial imaging by retro-reflection) can form a large aerial image in mid-air for digital signage. Resolution of the aerial image formed with AIRR is determined mainly by the retro-reflector, which is one of its components. However, increasing the resolution of aerial images by increasing the density of retro-reflective elements poses physical limitations and cost increases. The purpose of this
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An MPI-accelerated Monte Carlo algorithm for estimating the reflectance and transmittance properties of a wind-driven sea surface Opt. Rev. (IF 1.047) Pub Date : 2022-01-29 Yu Yang, Lixin Guo
The Preisendorfer and Mobley Monte Carlo model is a classical photon-rough sea surface interaction model that is used to study the reflectance and transmittance properties of the wind-driven sea surface. In this paper, we develop a computational framework and the implementation for parallel processing of this model by using Message Passing Interface. We then analyze the correspondence between serial
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Aerial imaging steganography method for aerial imaging by retro-reflection with dual acrylic ball Opt. Rev. (IF 1.047) Pub Date : 2022-01-26 Kengo Fujii, Masaki Yasugi, Satoshi Maekawa, Hirotsugu Yamamoto
This paper proposes a novel steganography method to show an aerial image that is formed with aerial imaging by retro-reflection by use of dual transparent balls made of acrylic resin. Our optical system forms a floating image screen in front of an acrylic ball that is placed on a beam splitter. We have confirmed our proposed optical system by performing optical ray-tracing simulations and experiments
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An arrayed-window microfluidic device for observation of mixed nanoparticles with an X-ray free-electron laser Opt. Rev. (IF 1.047) Pub Date : 2022-01-24 Matsumoto, Yutaka, Takeo, Yoko, Egawa, Satoru, Yamaguchi, Gota, Yokomae, Shunya, Takei, Masashi, Yumoto, Hirokatsu, Koyama, Takahisa, Ohashi, Haruhiko, Tono, Kensuke, Yabashi, Makina, Mimura, Hidekazu, Kimura, Takashi
A microfluidic device was developed for coherent diffraction imaging using an X-ray free-electron laser (XFEL-CDI). Liquid samples, which are separately packed in reservoirs of the device, are mixed in a flow channel after an XFEL irradiation as a trigger. An XFEL-CDI experiment was conducted and images of gold nanoparticles in solution were obtained with a resolution of several nanometers from single-shot
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Ultra-compact plasmonic unidirectional wavelength multiplexer/demultiplexer based on slot cavities Opt. Rev. (IF 1.047) Pub Date : 2022-01-17 Aparna, U., Kumar, M. Sathish
An ultra-compact plasmonic unidirectional wavelength multiplexer/demultiplexer based on slot cavities is proposed and numerically simulated. The structure consists of slot cavities which are etched on either sides of a metal–insulator–metal (MIM) bus waveguide. The cavities capture surface plasmon polariton (SPP) waves at their resonant wavelengths and unidirectionally couples them to the drop waveguide
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Numerical finite-difference time-domain calculation for extreme enhancement of magneto-optical effect at ultraviolet wavelength using Ni-subwavelength grating on SiO2/Ni structure Opt. Rev. (IF 1.047) Pub Date : 2022-01-11 Takashima, Yuusuke, Haraguchi, Masanobu, Naoi, Yoshiki
An extreme enhancement of the polar Kerr magneto-optical (MO) effect was numerically demonstrated using surface plasmon polaritons (SPPs) at the SiO2/Ni interface combined with the Ni-subwavelength grating (SWG). Utilizing the ω–k dispersion relation for the SPP at the SiO2/Ni interface, the parameters of Ni-SWGs were designed to couple the SPP mode with the incident light. The electromagnetic field
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Simulation on parameter optimization of gold nano-antenna attached to semiconductor ring resonator for heat-assisted magnetic recording device Opt. Rev. (IF 1.047) Pub Date : 2022-01-10 Chen, Jinghan, Katayama, Ryuichi, Sugiura, Satoshi
Heat-assisted magnetic recording is a technology to improve recording density for hard disks. The authors’ group has proposed a device, in which a gold nano-antenna as a near-field transducer is attached to a semiconductor ring resonator as an integrated light source. Localized surface plasmon resonance at the tip of nano-antenna excites near-field light to form small recorded marks to increase recording
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Effect of background materials in photonic crystal fiber sensor Opt. Rev. (IF 1.047) Pub Date : 2022-01-06 Rahaman, Md. Ekhlasur, Hossain, Md. Bellal, Mondal, Himadri Shekhar
In this study, an automobile wheel type photonic crystal fiber (PCF) has been designed to investigate the effect of the background material on analyte sensing. The designed PCF has a circular hollow core with eight slot-type air holes in cladding. The analysis is performed in the range of 0.5–1.5 THz, and different background materials are chosen during the simulation, for example, fused silica, BK7
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A spectroscopic study for determining linear optical and predicting nonlinear optical properties of sprayed ZnO:W thin films: an effect of morphology Opt. Rev. (IF 1.047) Pub Date : 2022-01-04 Bahedi, K., Addou, M., Mrigal, A., Ftouhi, H., Talbi, A., Cherrad, H., Fellahi, N., Bayoud, S.
This paper reports the linear and nonlinear optical spectroscopic study of tungsten-doped zinc oxide thin films (ZnO:W) with various dopant concentration grown by spray pyrolysis technique on pre-heated glass substrates at 450 °C. The ZnO:W thin films are polycrystalline with the hexagonal wurtzite structure and have a preferred orientation with the c-axis perpendicular to the substrates. SEM investigation
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Development of a new amblyopia-training device with polarizing films used under binocular conditions Opt. Rev. (IF 1.047) Pub Date : 2021-11-23 Iwata, Yo, Handa, Tomoya, Ishikawa, Hitoshi
We developed an amblyopia-training device, which can be used easily and inexpensively under binocular conditions with polarizing films. The device uses two polarizing films: one is attached to the training target (such as monitors and books), while the other is attached to the lens of glasses that cover the healthy eye with the absorption axis rotated 90 degrees. This allows the target to be presented
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Measurement and analysis of color shift behavior at image pattern edges projected by raster-scan RGB mobile laser projectors Opt. Rev. (IF 1.047) Pub Date : 2021-11-16 Kinoshita, Junichi, Takamori, Akira, Yamamoto, Kazuhisa, Kuroda, Kazuo, Suzuki, Koji
Color shift behavior at the edges of white-and-black line patterns was measured and analyzed for three raster-scan mobile projectors using the three-primary-color (red, green, blue) laser diodes. The 2D data of the line patterns projected on a standard diffusive reflectance screen were captured by a speckle measurement device for analyzing the effects of both the color speckle noise and the edge color
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Noise analysis of an electro-optic sensor system Opt. Rev. (IF 1.047) Pub Date : 2021-11-05 Tominaga, Mai, Okajima, Mei, Yamagishi, Mayuko, Shinagawa, Mitsuru, Katsuyama, Jun, Matsumoto, Yoshinori, Tomosada, Nobuhiro
This paper describes the noise analysis of an electro-optic (EO) sensor system based on experimental and simulation results. We developed a polarization simulator of the EO sensor system using the Jones vector and matrix. The polarization simulator included not only the laser intensity noise but also the laser polarization noise. The polarization noise was converted into an intensity noise due to the
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Consecutive monitoring method for pecan orchards and discovery of a mysterious circle in a pecan orchard with UAV Opt. Rev. (IF 1.047) Pub Date : 2021-11-01 Yamagata, H., Noda, K., Randall, J. J., Kamiya, H., Oki, K.
In this study, we established consecutive monitoring methods using UAV in pecan orchards of 64 ha each, in San Simon, Arizona, USA. Activity monitoring, tree height map creation and ground surface temperature analysis of trees by UAV with near infrared (NIR)/TIR camera were conducted for pecan orchards in San Simon, Arizona, USA. Using established continuous monitoring methods, the UAV images of a
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Fringe projection profilometry system verification for 3D shape measurement using virtual space of game engine Opt. Rev. (IF 1.047) Pub Date : 2021-10-19 Ueda, Kazumasa, Ikeda, Kanami, Koyama, Osanori, Yamada, Makoto
Fringe projection profilometry (FPP) is a technique used for obtaining the three-dimensional shape of an object in fields such as reverse engineering, cultural heritage, and computer vision. The FPP measurement accuracy significantly depends on the arrangement of the measurement system, measurement space conditions, equipment setting, and object characteristics. However, experimental verification of
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Fiber-scanning based ultra-compact near-eye display with a narrow-beam waveguide Opt. Rev. (IF 1.047) Pub Date : 2021-10-19 Kuno, Takuma, Nakamura, Toshiteru, Matsuda, Takahiro, Onoe, Shinsuke, Seo, Yoshiho, Ouchi, Satoshi
For ultra-compact near-eye display, waveguides provide a small form factor because they are thin shape plate, but projectors are too large due to the imaging sources, which results in bulky near-eye displays. Recent advances in fiber-scanning technology can overcome this limitation. Fiber-scasnning projectors produce an image by vibrating an optical fiber, and they can be small because only thin fibers
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Performance evaluation of praseodymium doped fiber amplifiers Opt. Rev. (IF 1.047) Pub Date : 2021-10-13 Mirza, Jawad, Ghafoor, Salman, Habib, Nazish, Kanwal, Firdos, Qureshi, Khurram Karim
In this paper, we report the performance evaluation of praseodymium doped fiber amplifier (PDFA) operating in 1.25–1.35 μm band of wavelengths based on theoretical simulation. The performance of the PDFA is evaluated by considering an optimized length of Pr\(^{3+}\) doped fiber, concentration of Pr\(^{3+}\) ions and pump power. Moreover, the impact of input signal wavelength on gain, amplified spontaneous
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Cryptanalysis for double-image encryption using the DTLM in frequency plane with QR decomposition and gyrator transform Opt. Rev. (IF 1.047) Pub Date : 2021-09-28 Anshula, Singh, Hukum
To enhance the security in optical image encryption scheme and to safeguard it from the invaders, this paper proposes a new scheme using devil’s toroidal lens masks (DTLMs) and QR decomposition in gyrator transform (GT) domain. The proposed cryptosystem utilizes DTLMs which are the complex phase masks designed using the combination of a phases of devil’s mask (\({\rm DM})\) and toroidal mask \(\left({\rm
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Ciphertext-only attacks on the double random phase encryption based on redundancy vulnerability Opt. Rev. (IF 1.047) Pub Date : 2021-09-22 Wu, Xingzhi, Zhang, Liwei, Chen, Haobo, Sun, Wenqing, Wu, Quanying
The double random phase encoding techniques have received considerable attention from researchers in recent years because of their advantages of parallel and high-speed processing capability. Meanwhile, the security of the cryptosystem is also one of the major concerns. We experimentally showed the ciphertext redundancy vulnerability of the coherent double random phase encryption (DRPE) system. Based
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Optical design of a stereoscopic adaptor lens for rigid 2D endoscopes Opt. Rev. (IF 1.047) Pub Date : 2021-09-14 Su, Wei-Chia, Yeh, Tien-Shou, Wang, Yen-Yu, Zhou, Shao-Kui, Hsiao, Fu-Li, Lin, Wen-Kai
During endoscopic surgery, the operation accuracy can be improved if the endoscope system provides 3D information. In this paper, an adaptor lens is presented for a commercial 2D endoscope to generate stereoscopic images. The function of the adaptor lens is verified in this study, and we prove the adaptor lens can be compatible with an arbitrary rigid 2D endoscope system even if its original imaging
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Generalized Kramers–Kronig relations and sum rules for moments and powers of degenerate four wave mixing susceptibility Opt. Rev. (IF 1.047) Pub Date : 2021-09-12 Saarinen, Jarkko J.
Generalized Kramers–Kronig (K–K) type dispersion relations and sum rules are derived in the static limit for the moments of the degenerate four wave mixing susceptibility. The degenerate nonlinear susceptibility is different from a typical use of the conventional K–K dispersion relations, which assume absence of complex poles of a function in the upper half of complex frequency plane, whereas degenerate
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Simulation on parameter optimization of semiconductor ring resonator with nano-antenna for heat-assisted magnetic recording device Opt. Rev. (IF 1.047) Pub Date : 2021-08-31 Chen, Jinghan, Katayama, Ryuichi, Sugiura, Satoshi
Heat-assisted magnetic recording (HAMR) is a promising technology with high recording density. The authors’ group has proposed a novel device for HAMR, in which a metal nano-antenna as a near-field transducer is attached to a semiconductor ring resonator as a light source. The ring resonator oscillation should be stable to generate steady near-field light with proper energy density to heat the recording
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Development of health monitoring method for pecan nut trees using side video data and computer vision Opt. Rev. (IF 1.047) Pub Date : 2021-08-27 Nomura, Ryota, Oki, Kazuo
Increasing efficiency and productivity in the field of agriculture is important to provide sufficient food to the world’s increasing population. It is important to monitor crops using image processing in order to realize these increases in efficiency and productivity. In order to monitor crops with high quality and accuracy, high resolution images are needed. In this research, a crop monitoring method
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Field of view enlargement with line symmetric image input technique of volumetric hologram waveguide for head mounted displays Opt. Rev. (IF 1.047) Pub Date : 2021-08-26 Nakamura, Toshiteru, Fujimura, Ryushi
We propose a field of view (FOV) enlargement method using the line symmetric image input in the single layer volumetric holographic waveguide. We build a mathematical model and analyze the virtual image to be seen by the observer considering the interaction volume of the signal light ray within the volumetric hologram waveguide. It is found that the diffracted light intensity is varied with each ray
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Design and numerical analysis of a photonic crystal fiber (PCF)-based flattened dispersion THz waveguide Opt. Rev. (IF 1.047) Pub Date : 2021-08-25 Jibon, Rayhan Habib, Bulbul, Abdullah Al-Mamun, Nahid, Abdullah-Al, Faragallah, Osama S., Baz, Mohammed, Eid, Mahmoud M. A., Rashed, Ahmed Nabih Zaki
We present the modeling of a porous core dispersion flatten photonic crystal fiber (PCF) for the fruitful transmission of THz signals. The model comprises only rectangular holes in both core and cladding areas. The model is numerically studied through simulation employing the finite element method (FEM)-based software. Simulation results disclose an insignificant amount of confinement loss (CL) of
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Multidimensional angle sensing method using guided-mode resonance Opt. Rev. (IF 1.047) Pub Date : 2021-08-24 Ura, Shogo, Tsuji, Ryugo, Inoue, Junichi, Kintaka, Kenji
A waveguide grating on a transparent substrate can serve as an optical notch filter owing to guided-mode resonance. The filtering wavelength is highly sensitive to an incidence angle. Potential of a two-dimensional grating for an application to three-dimensional angle-fluctuation sensing was investigated. Spectral variations due to the angle fluctuations were theoretically discussed and simulated using