Article
Mathematics
Tieyu Zhao, Yingying Chi
Summary: The research in this paper focused on the definition of linear summation of fractional-order matrices and its application in image encryption. A reformulation of the definitions and theoretical analysis were proposed. The study found that many weighted terms are invalid and showed that effective weighted terms depend on the period of the matrix. The research also demonstrated that image encryption methods based on weighted fractional-order transform may pose security risks due to key invalidation.
Article
Computer Science, Information Systems
Tieyu Zhao, Lin Yuan, Yingying Chi
Summary: The LWFRT has limitations in image encryption, leading to security risks of key invalidation. A new reformulation of the LWFRT is proposed to establish the relation between fractional-order transforms and analyze the reasons for key invalidation in image encryption. Numerical simulation verifies the perspective of the study.
JOURNAL OF VISUAL COMMUNICATION AND IMAGE REPRESENTATION
(2021)
Article
Optics
Phool Singh, Ravi Kumar, A. K. Yadav, Kehar Singh
Summary: This paper analyzes the security of a nonlinear optical cryptosystem based on DRPE, showing its resistance to conventional attacks but vulnerability to modified attacks.
OPTICS AND LASERS IN ENGINEERING
(2021)
Article
Multidisciplinary Sciences
Tieyu Zhao, Yingying Chi
Summary: The study introduced the multiple-parameter fractional Fourier transform (MPFRFT) as an image encryption algorithm, but found many of its keys to be invalid, reducing security. By reformulating the MPFRFT and analyzing using different basis functions, it was discovered that the effective keys were extremely limited, highlighting the security risk of key invalidation in extended encryption methods based on MPFRFT.
Article
Optics
Yabin Zhang, Li Zhang, Zhi Zhong, Lei Yu, Mingguang Shan, Yigui Zhao
Summary: A novel asymmetric image encryption method combines hyper-chaotic system, DNA-level operation, Arnold transform, and phase-truncated fractional Fourier transform to convert plaintext into ciphertext with high security and robustness. The method utilizes large key space and high sensitivity to keys, requiring correct keys for achieving useful information, and demonstrates good security and resistance to various attacks.
OPTICS AND LASERS IN ENGINEERING
(2021)
Letter
Optics
Hang Chen, Zhengjun Liu, Camel Tanougast, Walter Blondel
Summary: The optical image scheme using fractional Fourier transform and DNA sequence operation has issues with the DNA xor operation and optical implementation, leading to inability to completely decrypt the original image through the inverse encryption process.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Computer Science, Information Systems
Yan Sun, Cun Zhu, Qi Cui
Summary: This research explores the features of speech and image signals from the perspectives of time and frequency domains, and proposes a method that combines fractional Fourier Transform with speech encryption. The results show that this method can enhance the security of speech and is easily applicable in practical scenarios.
CMC-COMPUTERS MATERIALS & CONTINUA
(2022)
Article
Computer Science, Information Systems
Jie Fang, Minghao Jiang, Nannan Yin, Da Wei, Yin Zhang
Summary: This paper presents an image block encryption algorithm using FRFT, hyperchaotic system, improved logistic map, and DNA encoding. The algorithm enhances the complexity and security of the data through multiple processing and operation.
MULTIMEDIA TOOLS AND APPLICATIONS
(2022)
Article
Physics, Applied
Maria Solyanik-Gorgone, Haoyan Kang, Behrouz Movahhed Nouri, Hamed Dalir, Volker J. Sorger
Summary: In recent years, there has been significant interest in heterogeneous machine learning accelerators. Meanwhile, the post-quantum encryption era increases the demand for data security. This work presents an optical hashing and compression scheme inspired by SWIFFT algorithms and demonstrates the potential of analog optical accelerators for machine learning classification on encrypted data. The proposed algorithm can provide a significant increase in processing speed compared to non-compressed input.
APPLIED PHYSICS REVIEWS
(2023)
Article
Computer Science, Information Systems
Wanqing Wu, Qiao Wang
Summary: This paper proposes a novel image encryption scheme based on chaotic map and fractional Fourier transformation. The scheme divides the image into blocks, selects high correlation blocks for transformation, changes pixel values using a key related to the plain image, and scrambles the entire image using the Baker Map. The scheme has been verified to have high security and can effectively resist different types of attacks.
MULTIMEDIA TOOLS AND APPLICATIONS
(2023)
Article
Computer Science, Information Systems
Gaurav Verma, Wenqi He, Xiang Peng
Summary: In this paper, a novel four-image encryption method using biometric keys based on a compressive phase retrieval algorithm is proposed. The encryption procedure combines a phase retrieval algorithm and a distinct biometric phase mask key to increase the non-linearity of the process and enhance system security against unauthorized attacks. Multiple phase keys generated from a single biometric hologram during the numerical reconstruction process provide digital keys for encryption and decryption. The proposed scheme achieves reduced space for data storage and transmission over a communication channel and exhibits better performance than reported methods.
MULTIMEDIA TOOLS AND APPLICATIONS
(2023)
Article
Mathematics, Interdisciplinary Applications
Tieyu Zhao, Yingying Chi
Summary: In this paper, the authors utilize quantum Fourier transform and quantum phase estimation to achieve quantum fractional Fourier transform, and establish the relationship between quantum fractional Fourier transform and a classical algorithm. The flaws in the definitions of multi-fractional Fourier transform are observed, and the circuit of quantum fractional Fourier transform and the reasons for the observed defects are analyzed.
FRACTAL AND FRACTIONAL
(2023)
Article
Engineering, Electrical & Electronic
Deyun Wei, Jun Yang
Summary: The discrete fractional Fourier transform is a useful tool in non-stationary signal processing. This paper proposes a two-dimensional sparse fractional Fourier transform (2D SFRFT) algorithm, which achieves the lowest runtime and sample complexity compared to existing methods. The algorithm is improved to be robust by analyzing errors due to noises, and its effectiveness is demonstrated in various applications.
Article
Computer Science, Information Systems
Limin Tao, Xikun Liang, Zhijing Wu, Lidong Han, Jiangping Zhu
Summary: In this paper, a composed optical image hybrid encryption scheme is proposed, which combines optical image encryption with digital image encryption. The scheme consists of two main parts, including double random phase encoding in a 4f optical system for encrypting the original image and performing parallel diffusion and confusion on the resulting images. The algorithm utilizes fractional Fourier transform, generalized chaos, and nonlinear transform of matrices. The secureness of the cryptosystem is confirmed by cipher statistical analysis, encryption simulations, and performance analysis. The innovation lies in integrating high-dimensional chaotic digital image encryption into the optical image encryption system and proposing a separate encryption paradigm for real and imaginary images, which greatly enhances the security of image encryption and transmission.
JOURNAL OF GRID COMPUTING
(2023)
Article
Optics
Osama S. Faragallah, Hala S. El-sayed, Ashraf Afifi, Walid El-Shafai
Summary: This paper presents an effective and secure opto color image cryptosystem using 2D Fractional Fourier Transform (2D FrFT) and 2D logistic mapping (2D LM), addressing issues encountered in existing encryption methods.
OPTICS AND LASERS IN ENGINEERING
(2021)
Article
Optics
Tomi Pitkaaho, Ville Pitkakangas, Mikko Niemela, Sudheesh K. Rajput, Naveen K. Nishchal, Thomas J. Naughton
Article
Optics
Sudheesh K. Rajput, Osamu Matoba, Yasuhiro Awatsuji
Article
Optics
Sudheesh K. Rajput, Osamu Matoba
Article
Biochemical Research Methods
Sudheesh K. Rajput, Manoj Kumar, Xiangyu Quan, Mitsuhiro Morita, Tomoyuki Furuyashiki, Yasuhiro Awatsuji, Enrique Tajahuerce, Osamu Matoba
JOURNAL OF BIOMEDICAL OPTICS
(2020)
Article
Optics
Manoj Kumar, Osamu Matoba, Xiangyu Quan, Sudheesh K. Rajput, Yasuhiro Awatsuji, Yosuke Tamada
Summary: The demand for single-shot and common-path holographic systems has been increasing, as they offer advantages such as reduced computational complexity and high stability. A single-shot common-path off-axis digital holographic setup based on a beam splitter and pinhole has been developed for applications including quantitative phase imaging, micro-optics testing, industrial inspection, and sound field visualization.
Article
Optics
Yuki Takase, Kazuki Shimizu, Shogo Mochida, Tomoyoshi Inoue, Kenzo Nishio, Sudheesh K. Rajput, Osamu Matoba, Peng Xia, Yasuhiro Awatsuji
Summary: Sound field imaging techniques play a crucial role in acoustic designs. This paper presents innovative techniques using parallel phase-shifting digital holography to image sound fields radiated from speakers. Experimental results demonstrate the successful imaging of sound fields, along with digital refocusing and object position measurements capabilities. The presented method is shown to be very useful and suitable for sound field imaging.
Article
Optics
Sudheesh K. Rajput, Osamu Matoba
Article
Optics
Sudheesh K. Rajput, Osamu Matoba, Manoj Kumar, Xiangyu Quan, Yasuhiro Awatsuji
Summary: A new method for recording and visualizing sound waves using common-path digital holography has been presented, utilizing a single light beam to carry the sound information without the need for an additional reference beam. This configuration simplifies the system and is suitable for observing invisible sound phenomena at far distances.
OPTICS AND LASERS IN ENGINEERING
(2021)
Article
Engineering, Electrical & Electronic
Xiangyu Quan, Manoj Kumar, Sudheesh K. Rajput, Yosuke Tamada, Yasuhiro Awatsuji, Osamu Matoba
Summary: Multimodal optical microscopy systems combine different optical and physiological principles to obtain rich perspectives from a single biological event. Both methods based on off-axis digital holography and transport-of-intensity equation enable simultaneous quantitative phase and fluorescence imaging in 3D space, with fast acquisition and digital refocusing capability. Feasibility checks with fluorescent micro-beads and live plant cells demonstrated the effectiveness of these methods.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Sudheesh K. Rajput, Osamu Matoba, Manoj Kumar, Xiangyu Quan, Yasuhiro Awatsuji, Yosuke Tamada, Enrique Tajahuerce
Summary: The study presents a multimodal technique for cross-sectional quantitative phase and fluorescence imaging using computational microscopy. The hybrid imaging system is simple, compact, and non-iterative, suitable for imaging biological samples. Experimental results on microbeads and fluorescent protein-labeled living cells demonstrate the performance of the proposed system.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Proceedings Paper
Engineering, Biomedical
Yuki Takase, Kazuki Shimizu, Syogo Mochida, Tomoyoshi Inoue, Kenzo Nishio, Sudheesh K. Rajput, Osamu Matoba, Toshihiro Kubota, Yasuhiro Awatsuji
BIOMEDICAL IMAGING AND SENSING CONFERENCE 2020
(2020)
Proceedings Paper
Engineering, Biomedical
Noda Takumi, Xiangyu Quan, Sudheesh Rajput, Osamu Matoba, Yasuhiro Awatsuji
BIOMEDICAL IMAGING AND SENSING CONFERENCE 2020
(2020)
Proceedings Paper
Optics
Osamu Matoba, Sudheesh K. Rajput, Manoj Kumar, Xiangyu Quan, Yosuke Tamada, Yasuhiro Awatsuji, Enrique Tajahuerce
THREE-DIMENSIONAL IMAGING, VISUALIZATION, AND DISPLAY 2020
(2020)
Proceedings Paper
Optics
Sudheesh K. Rajput, Osamu Matoba
HOLOGRAPHY, DIFFRACTIVE OPTICS, AND APPLICATIONS VIII
(2018)
Proceedings Paper
Optics
Sudheesh K. Rajput, Osamu Matoba
THREE-DIMENSIONAL IMAGING, VISUALIZATION, AND DISPLAY 2018
(2018)
Article
Optics
Hang Dong, Zhixin Sun, Jingyi Li, Yahui Li, Wei Zhang, Guangyong Jin
Summary: This paper calculates thermal stresses and adsorption forces to determine laser cleaning conditions and establishes relevant models. Experimental results show that the removal effect is better with increasing nanosecond pulse delay, with the best effect achieved at 600 milliseconds pulse delay. Based on the findings, the mechanisms of oxide film removal involve thermal stress against adsorption and plasma shock wave breaking the oxide layer.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Junjie Zhang, Wenjun Li, Bingtao Li, Zheng-Da Hu, Jicheng Wang, Feng Zhang, Lei Wang
Summary: A multilayer thin film device structure based on Tamm plasmons is proposed for high-performance near-infrared hot electron photodetectors. By optimizing the device structure parameters, high responsivity detection can be achieved.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Hong Huang, Zhiguang Han
Summary: This paper proposes a new ghost imaging reconstruction method using ordered orthogonal Hadamard derived speckle as the illumination speckle series, and introduces the alternating direction multiplier method to improve the imaging performance. The evaluation results show that the method can achieve high-quality reconstructed images under low sampling conditions.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Moritsugu Sakamoto, Yuki Ono, Kohei Noda, Tomoyuki Sasaki, Nobuhiro Kawatsuki, Masayuki Tanaka, Hiroshi Ono
Summary: The effect of wavelength and polarization of illuminating light in polarization imaging for birefringent objects placed behind a scattering structure was experimentally investigated. The result shows that the spatial distribution of the birefringent object was more clearly visualized in the longer wavelength combined with circularly polarized light illumination. This finding indicates the potential of using polarization imaging with circularly polarized light illumination in the near-infrared range for visualizing birefringent objects with scattering.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Peihui Du, Hongfang Wang, Pengwei Li, Rukeyemuhan Abadula, Hmbat Batelbek, Min Gao
Summary: In this study, we theoretically demonstrate the strong coupling between Tamm plasmons and exciton polaritons in metal Al/DBR-molecular structures, extending the operating wavelength to the deep ultraviolet region. The coupling strength can be effectively manipulated by adjusting the structure parameters, offering potential benefits for the development of new-style optical filters.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Priyanka Chaudhary, Akhilesh Kumar Mishra
Summary: We design and numerically investigate the switching dynamics between two outer waveguides in a parity-time (PT)-symmetric adiabatically coupled three waveguides nonlinear directional coupler (NLDC) system. The study shows that the device can provide switching even when the middle waveguide is nonlinear and the outer waveguides are linear. Furthermore, the effect of loss to gain ratio on critical switching power and the impact of launched light power and gain (loss) value on transmitted power are also studied.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Wei Feng, Yongcong Yi, Shuyang Li, Zhi Xiong, Boya Xie, Zhen Zeng
Summary: Traditional imaging techniques are ineffective in achieving clear underwater imaging due to the presence of scattering media. Single-pixel imaging (SPI) system based on Unet++ offers a solution for reconstructing high-quality images in highly turbid water environments.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Xiaorui Qu, Jufeng Zhao, Haijun Tian, Junjie Zhu, Guangmang Cui
Summary: This paper studies the structural similarity between RGB and spectral images and proposes a non-iterative Images Structure Similarity (ISS) method for fast reconstruction of spectral images. Additionally, the input of the Deep Image Prior (DIP) method is optimized for the first time by using the initial spectral data reconstructed by ISS, leading to an improved starting value for the iteration. The experimental results show that the proposed method can enhance the reconstruction quality in both spectral and spatial resolutions, while significantly reducing the reconstruction time compared to other DIP-based methods.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Donghe Sheng, Zhe Han, Zanyang Qiao, Tianpei Dong, Chenxi Wang, Huiping Tian
Summary: In this study, a distributed multi-parameter sensor based on an etched few-mode multi-core fiber is proposed, allowing simultaneous sensing of temperature, strain, and sample refractive index. By combining space division multiplexing and stimulated Brillouin scattering, the sensor achieves high sensitivity in detecting these parameters.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Dehao Chen, Zhenwu Mo, Zehong Liang, Junjie Jiang, Huilin Tang, Yidan Sun, Ziyu Wang, Quanfeng Wei, Yanru Chen, Dongmei Deng
Summary: In this study, a novel family of elliptical Airyprime vortex beams (EAPVBs) is introduced, which inherits the excellent self-focusing properties of the circular Airyprime vortex beam (CAPVB). The asymmetric focusing of EAPVB leads to some novel properties, such as the splitting of high-order optical vortex and the formation of two foci. By taking advantage of these properties, EAPVB is constructed as a tunable optical bottle for particle capture.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Xiao Ma, Qiongchan Shao, Jian-Jun He
Summary: In this study, an SHS chip based on Su8 waveguide was designed and fabricated. By physically adjusting the metal electrodes and compensating for transmissivity fluctuations, the generation of side ripples was successfully suppressed.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Hongbin Zhang, Jiansen Du, Zongtao Chi, Hailin Cong, Bin Wang
Summary: In this paper, a novel type of dual-wavelength confocal metalens is proposed to solve the spatial crosstalk between two wavelengths. The metalens can greatly reduce the spatial crosstalk and achieve high precision and efficiency in confocal imaging. It can also focus light in specific wavelength ranges, making it suitable for imaging, microscopy, and optical fiber communication.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Rui Qiu, Guanmao Zhang, Shaokai Du, Jie Liu, Hongyu Jib, Kaiyun Bi, Bochuan Xing, Guangchao Diao
Summary: Recent research has developed an achromatic metalens that shows potential for replacing traditional lenses. This study focuses on a continuously variable focus height broadband achromatic metalens for long-wavelength infrared applications. By optimizing materials and parameters, chromatic aberration is effectively corrected, making it suitable for high-resolution LWIR imaging and spectroscopy systems.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Marcos Troncoso-Costas, Gaurav Jain, Yiming Li, Mohammed Patel, Lakshmi Narayanan Venkatasubramani, Sean O'Duill, Frank Smyth, Andrew Ellis, Francisco Diaz-Otero, Colm Browning, Liam Barry
Summary: In this work, a fast-switching tuneable laser capable of wide wavelength coverage, low noise and linewidth levels suitable for high-order modulation formats is demonstrated. The laser is characterized to cover a wavelength range of 35 nm in the C-band with nanosecond switching time. It is used to successfully demonstrate 480 Gbit/s 16QAM transmission over 25 km of single-mode fiber for a wavelength range of 19 nm.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Takeshi Moriyasu, Masahiko Tani, Hideaki Kitahara, Takashi Furuya, Jessica Afalla, Toshiro Kohmoto, Daishiro Koide, Hiroki Sato, Mitsutaka Kumakura
Summary: Optical pump-terahertz probe spectroscopy was used to study the photocarrier dynamics and optical characteristics of semiconductor Si. The results showed that the thickness of Si influenced the transmitted terahertz field amplitude and peak delay time, indicating differences in photocarrier dynamics between different Si materials.
OPTICS COMMUNICATIONS
(2024)
