Article
Optics
Ting Men, Liyuan Tang, Haocheng Tang, Yaodan Hu, Ping Li, Jingqin Su, Yanlei Zuo, Cheng-Ying Tsai, Zhengzheng Liu, Kuanjun Fan, Zhengyan Li
Summary: Fourier-transform spectral imaging captures frequency-resolved images with high spectral resolution and wide spectral range. A new perspective on Fourier-transform spectral imaging is proposed, based on a generalized central slice theorem analogous to computerized tomography, which allows high-efficiency hyperspectral imaging and spatiotemporal optical field characterization without a loss of spectral and spatial resolutions.
Article
Multidisciplinary Sciences
Piotr Ryczkowski, Caroline G. Amiot, John M. Dudley, Goery Genty
Summary: Computational spectral-domain ghost imaging is demonstrated by encoding complementary Fourier patterns onto the spectrum of a superluminescent laser diode, increasing signal-to-noise ratio and reducing parasitic light effects. This method has broad applications in remote broadband spectral measurements.
SCIENTIFIC REPORTS
(2021)
Article
Computer Science, Artificial Intelligence
Weiwen Wu, Dianlin Hu, Chuang Niu, Lieza Vanden Broeke, Anthony P. H. Butler, Peng Cao, James Atlas, Alexander Chernoglazov, Varut Vardhanabhuti, Ge Wang
Summary: Spectral computed tomography is a promising imaging technique, and this study introduces a deep learning based reconstruction method ULTRA, which emphasizes multi-scale feature fusion and multi-channel filtering enhancement with a denser connection encoding architecture to address challenges in spectral CT image reconstruction.
Article
Engineering, Electrical & Electronic
Lingfei Song, Lizhi Wang, Min H. Kim, Hua Huang
Summary: This paper proposes a high-accuracy image formation model to reduce the gap in CASSI. Channel-wise convolution and PSF estimation are used to improve the reconstruction quality, and a theoretical analysis of the effects of PSF is provided for guiding CASSI system implementation.
IEEE TRANSACTIONS ON COMPUTATIONAL IMAGING
(2022)
Review
Optics
Longqian Huang, Ruichen Luo, Xu Liu, Xiang Hao
Summary: This article reviews state-of-the-art deep-learning-empowered computational spectral imaging methods, which possess fast reconstruction speed, excellent reconstruction quality, and the potential to reduce system volume significantly.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Biology
Weiwen Wu, Hengyong Yu, Fenglin Liu, Jianjia Zhang, Varut Vardhanabhutt
Summary: A new algorithm SITBIM is proposed in this study to improve the signal-to-noise ratio of spectral computed tomography (CT) images by introducing bidirectional image gradient with L0-norm constraint, outperforming other state-of-the-art methods.
COMPUTERS IN BIOLOGY AND MEDICINE
(2022)
Article
Chemistry, Analytical
Guoxuan Liu, Huaidong Yang, Hansen Zhao, Yinxin Zhang, Sichun Zhang, Xinrong Zhang, Guofan Jin
Summary: The study developed hyperspectral SIM technology, enabling high-speed spectral super-resolution imaging in SIM for the first time. By optically mapping the three-dimensional datacube of the sample to the detector plane, it allows simultaneous detection and retention of sample spectrum information.
ANALYTICAL CHEMISTRY
(2021)
Article
Instruments & Instrumentation
Shangwei Guo, Wenhao Li, Zhengchao Lai, Xiantong Meng, Shaokun Han, Yu Zhai
Summary: A new Multi-Spectral Polarimetry Streak Tube Imaging LiDAR system is proposed, capable of multi-spectral polarimetry imaging and three-dimensional imaging with higher depth resolution and larger depth of field. By fusing the spectral information, polarization information, and three-dimensional information obtained by the system, the image contrast of the target area can be improved.
INFRARED PHYSICS & TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Xiaodong Guo, Yonghui Li, Dingyue Chang, Peng He, Peng Feng, Hengyong Yu, Weiwen Wu
Summary: The paper proposes an iterative deep reconstruction network, Spectral2Spectral, which combines unsupervised methods and data priors into a unified framework to obtain high-quality images from noisy data in an end-to-end fashion. The structural similarity prior in the image-spectral domain is refined as a regularization term to further constrain network training. The weights of the neural network are automatically updated to capture image features and structures within the iterative process.
IEEE TRANSACTIONS ON COMPUTATIONAL IMAGING
(2023)
Article
Astronomy & Astrophysics
Emma Perracchione, Paolo Massa, Anna Maria Massone, Michele Piana
Summary: This study aims to design an image reconstruction method relying on enhanced visibility interpolation in the Fourier domain, utilizing Variably Scaled Kernels (VSKs) to achieve feature augmentation. Compared to previous interpolation-based algorithms, VSKs offer significantly better performance in image reconstruction, particularly in cases of sparse Fourier domain sampling or specific flaring source characteristics.
ASTROPHYSICAL JOURNAL
(2021)
Article
Geochemistry & Geophysics
Tong Zhang, Shengjie Zhao, Xu Ma, Andres Ramirez-Jaime, Qile Zhao, Gonzalo R. Arce
Summary: Coded aperture snapshot spectral imager (CASSI) uses compressive sensing algorithms to sense the spectral information of a 2-D scene and capture coded measurement data for 3-D spatio-spectral datacube reconstruction. This letter introduces a method to achieve equivalent grayscale modulation in CASSI by intentionally introducing misalignment between the coded aperture (CA) pixels and the focal plane array (FPA) pixels. Numerical experiments show that this misalignment-induced grayscale modulation significantly improves CASSI reconstruction without additional cost to the system.
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Shaoyu Wang, Haijun Yu, Yarui Xi, Changcheng Gong, Weiwen Wu, Fenglin Liu
Summary: In this study, a spectral-image decomposition with energy-fusion sensing (SIDES) reconstruction method is proposed to obtain better quality spectral images and material decomposition results by establishing a unified tensor decomposition model. The method fully explores spatial sparsity, global correlation across the spectrum, and nonlocal self-similarity properties, and outperforms the state-of-the-art in numerical simulations and real experiments.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2021)
Article
Optics
Xiangzhe Zhang, Liqing Huang, Jingping Zhu, Ning Zhang, Kang Zong, Lipeng Zhai, Yu Zhang, Yakun Cai, Huimin Wang
Summary: The OPD equations of dual Wollaston prisms with an adjustable air gap are derived using the wave normal tracing method, and their validity is verified. The performance of a novel static birefringent Fourier transform imaging spectrometer based on these prisms is investigated.
Article
Engineering, Biomedical
Xueshen Li, Shengting Cao, Hongshan Liu, Xinwen Yao, Brigitta C. Brott, Silvio H. Litovsky, Xiaoyu Song, Yuye Ling, Yu Gan
Summary: This study proposes a method of speeding up imaging of coronary artery disease by downsizing the data acquisition process in both the spectral and spatial domains, and improving the quality of image reconstruction through a multiscale reconstruction framework. Experimental results show that data downscaled in both the spectral and spatial domains are easier to reconstruct compared to data downscaled solely in either domain.
IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING
(2022)
Article
Multidisciplinary Sciences
Longqiang Luo, Shuo Li, Xinli Yao, Sailing He
Summary: The research team designed and implemented a compact and lightweight hyperspectral scanner, as well as a novel rotational hyperspectral scanning method. They developed an image algorithm to reconstruct images from angular recorded hyperspectral data cubes. After calibration, the system showed a spectral resolution of 5 nm, and discussions on spatial accuracy and spectral precision were based on additional experiments.
SCIENTIFIC REPORTS
(2021)
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)