Article
Optics
Zhiyuan Ye, Peixia Zheng, Wanting Hou, Dian Sheng, Weiqi Jin, Hong-Chao Liu, Jun Xiong
Summary: This paper introduces a new technology called computational convolutional ghost imaging (CCGI), which uses a single-pixel photodetector and structured illumination to perform convolution operations, enabling direct observation of the features of interest in a target without imaging. The CCGI scheme can adaptively work under sub-Nyquist sampling conditions and is suitable for real-time non-imaging edge detection.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Optics
Ye Hualong, Zhang Leihong, Zhang Dawei
Summary: This paper proposed a non-imaging target recognition technology based on projection matrix and image Euclidean distance by computational ghost imaging. The main features of spatial sample images are extracted by principal component analysis. The algorithm improves the accuracy of traditional target recognition algorithms without reconstructing the image.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Optics
Liansheng Sui, Zhi Pang, Ying Cheng, Yin Cheng, Zhaolin Xiao, Ailing Tian, Kemao Qian, Asundi Anand
Summary: A computational ghost imaging method based on sparse reconstruction with compressive sensing technique is proposed in this paper to reduce key management burden and achieve efficient encryption. Additionally, sharing a small part of the security key in the secure channel can still authenticate original information, as demonstrated in optical experiments.
OPTICS AND LASERS IN ENGINEERING
(2021)
Article
Optics
Harry Penketh, William L. Barnes, Jacopo Bertolotti
Summary: Computational ghost imaging is a method for reconstructing images by illuminating an object with known patterns and collecting scattered light. It has been found that by choosing different illumination patterns, the reconstruction process can behave like a spatial filtering operation on the image, allowing for bypassing post-processing steps and avoiding noise amplification.
Article
Optics
Peixia Zheng, Qilong Tan, Hong-chao Liu
Summary: An inverse computational ghost imaging (GI) scheme is proposed in this study, where bucket signals are selected first and random patterns are calculated correspondingly. Compared with traditional computational GI, the inverse GI not only disguises bucket signals but also provides an opportunity to combine with other cryptographies, enriching the encryption process and enhancing security.
Article
Chemistry, Multidisciplinary
Min Tao, Xiaobin Gong, Jian Guan, Junfeng Song, Zhixin Song, Xueyan Li, Shuxu Guo, Jian Chen, Siyao Yu, Fengli Gao
Summary: The study proposes a method to screen data by setting two threshold values during the sampling process, which can improve the quality of reconstructed images and speed up the computation process.
APPLIED SCIENCES-BASEL
(2021)
Article
Optics
Wen-Kai Yu, Ning Wei, Ya-Xin Li, Ying Yang, Shuo-Fei Wang
Summary: This research proposes a multi-party interactive CKD protocol under a computational ghost imaging framework, which enhances the security of communication through joint identity authentication via fragment synthesis.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Chemistry, Analytical
Woohyuk Jang, Chaewon Lee, Dae Sik Jeong, Kunyoung Lee, Eui Chul Lee
Summary: The objective of this study was to develop an automated system for recognizing banknote serial numbers using a deep learning-based optical character recognition framework. A model was developed for recognizing the serial numbers of banknotes from South Korea, the United States, India, and Japan. The model's accuracy and generalization performance were improved through data augmentation and fine-tuning. The proposed method achieved real-time processing of less than 30 ms per image and character recognition with 99.99% accuracy.
Article
Optics
Qingtian Guan, Huaxia Deng, Wenbo Liang, Xiang Zhong, Mengchao Ma
Summary: This research proposes a computational ghost imaging encryption and watermarking method with a small key storage space. It uses the Arnold transform to encrypt the measurement matrix in computational ghost imaging and introduces independent component analysis to increase the difficulty of cracking. The method also includes two watermarking strategies to ensure data integrity. The feasibility of this method is verified through numerical simulations and optical experiments.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Chemistry, Multidisciplinary
Lu Yu, Hongbo Li, Jing Li, Wei Li
Summary: The large-aperture static imaging spectrometer (LASIS) is an interference spectrometer that offers high device stability, high throughput, a wide spectral range, and a high spectral resolution. In order to compress the data acquired by LASIS, a lossless compression scheme is proposed that combines a novel data rearrange method and the lossless multispectral and hyperspectral image compression standard CCSDS-123. The experimental results demonstrate that the proposed scheme outperforms traditional methods and provides a higher compression ratio while maintaining the quality of the data.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Electrical & Electronic
Zhaohua Yang, Wang Li, Zhengyan Song, Wen-Kai Yu, Ling-An Wu
Summary: Computational ghost imaging captures images through the correlation between illumination patterns and object signals. A tracking compensation method has been proposed to eliminate motion blur, providing high quality reconstruction for moving objects. This method shows potential for various applications such as object tracking, remote sensing, and real-time imaging, outperforming conventional CGI.
IEEE SENSORS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Henry Arguello, Jorge Bacca, Hasindu Kariyawasam, Edwin Vargas, Miguel Marquez, Ramith Hettiarachchi, Hans Garcia, Kithmini Herath, Udith Haputhanthri, Balpreet Singh Ahluwalia, Peter So, Dushan N. Wadduwage, Chamira U. S. Edussooriya
Summary: Computational optical imaging (COI) systems use optical coding elements (CEs) to encode and decode high-dimensional scenes, relying on computational algorithms. Recent advances in data-driven design using deep neural networks (DNNs) have allowed for the optimization of CE and computational decoder parameters in an end-to-end (E2E) manner. This work surveys the progress in CE data-driven design and provides guidelines for incorporating different optical elements into the E2E framework. The E2E framework can handle various inference tasks, including spectral imaging reconstruction and pose estimation, and has been used to achieve classification and 3D object recognition at the speed of light using all-optics DNNs.
IEEE SIGNAL PROCESSING MAGAZINE
(2023)
Article
Optics
Sui Liansheng, Zhang Liwen, Cheng Ying, Xiao Zhaolin, Tian Ailing, Asundi Anand
Summary: A framework of computational ghost imaging based on conditional adversarial network is proposed to improve the visual quality of noisy images reconstructed by traditional ghost imaging. The use of multiple loss metrics in the objective function avoids training instability of the network.
OPTICS COMMUNICATIONS
(2021)
Article
Optics
E. Baradit, M. Avendano, G. Canas, M. Yanez, M. Trivi, J. Carine
Summary: This paper investigates the application of qualitative algorithms in processing images with dynamic speckle to generate a three-dimensional intensity map for characterizing the topography of a sample. Various algorithms are reviewed and evaluated for their robustness to the number of frames and dependence on the illumination profile. The results show that the normalized DJC method achieves stable characterization of hidden topography under a layer of paint.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Optics
Chenxiang Xu, Dekui Li, Kai Guo, Zhiping Yin, Zhongyi Guo
Summary: In this paper, an encryption scheme by computational ghost imaging (CGI) is proposed, in which the transmitting data are hidden in the illumination patterns. The sender uses a set of key-patterns (KPs) to hide the data, and only needs to transfer a key vector containing the KPs labels through a private channel. The receiver can decrypt the patterns acquired from the public channel with the correct KPs, and recover the image with the aid of bucket detector values. The encrypted transmission in our scheme is secure, convenient, and fast, which is important for the practical application of CGI encryption.
OPTICS COMMUNICATIONS
(2023)
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)