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Intelligent tailoring of a broadband orbital angular momentum comb towards efficient optical convolution

Photonics Research 2025年第5期13卷 1148-1157页

作者： Zhou, Shiyun Li, Lang Wang, Yishu Gao, Liliang Zhang, Zhichao Gao, Chunqing Fu, Shiyao School of Optics and Photonics Beijing Institute of Technology Beijing100081 China Key Laboratory of Photoelectronic Imaging Technology and System Ministry of Education Beijing100081 China Key Laboratory of Information Photonics Technology Ministry of Industry and Information Technology Beijing100081 China National Key Laboratory on Near-surface Detection Beijing100072 China

Due to the high-dimensional characteristics of photon orbital angular momentum (OAM), a beam can carry multiple OAMs simultaneously thus forming an OAM comb, which has been proved to show significant potential in both classical and quantum photonics. Tailoring broadband OAM combs on demand in a fast and accurate manner is a crucial basis for their application in advanced scenarios. However, obtaining phase-only gratings for the generation of arbitrary desired OAM combs still poses challenges. In this paper, we propose a multi-scale fusion learning U-shaped neural network that encodes a phase-only hologram for tailoring broadband OAM combs on-demand. Proof-of-principle experiments demonstrate that our scheme achieves fast computational speed, high modulation precision, and high manipulation dimensionality, with a mode range of −75 to +75, an average root mean square error of 0.0037, and a fidelity of 85.01%, all achieved in about 30 ms. Furthermore, we utilize the tailored broadband OAM combs in conducting optical convolution calculation, enabling vector convolution for arbitrary discrete functions, showcasing the extended capability of our proposal. This work opens, to our knowledge, new insight for on-demand tailoring of broadband OAM combs, paving the way for further advancements in high-dimensional OAM-based applications. © 2025 Chinese Laser Press.

关键词： Angular momentum

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Target detection enhancement method through multi-dimensional information differential projection and fusion

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Optics Express 2025年第10期33卷 21116-21131页

作者： Dong, Xue Lan, Yubo Zhao, Zongmin Cai, Chang Zhou, Zhiming Zhang, Tong Han, Pingli Xiang, Meng Liu, Jinpeng Xie, Peiyue Liu, Fei School of Optoelectronic Engineering Xidian University Xi’an 710071 China Xi’an Key Laboratory of Computational Imaging Xi’an 710071 China National Key Laboratory of Infrared Detection Technologies Shanghai 200083 China Beijing Key Laboratory of Advanced Optical Remote Sensing Technology Beijing 100094 China

As a powerful detection tool, spectral polarization imaging (SPI) reveals spatial, spectral, and polarization characteristics. When combined with deep learning, its detection capabilities can be further improved. However, SPI requires the acquisition and processing of large-scale data, and it is still facing significant challenges in detecting targets in complex scenes with reduced contrast, loss of spatial structures, and cluttered backgrounds. Hence, an innovative target detection enhancement method via multi-dimensional information differential projection and fusion is presented based on our self-developed SPI systems. It primarily comprises a target retrieval algorithm based on angle of polarization purification and a novel projection and fusion strategy, which can effectively exploit, enhance, and utilize the multi-dimensional distinctions between the target and background. The resulting fused image visualizes these distinctions, thereby highlighting the target from its background. Experiment results demonstrate the efficacy of our method in detecting targets with shielding, camouflage and shape loss in complex natural environments, i.e., grasslands, woodlands, and sky. This significantly enhances scenario comprehension and detection efficiency without extensive computation or model training, making it especially advantageous for military reconnaissance applications. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Color spaces Deep learning imaging techniques Machine learning Polarimetric imaging Underwater imaging

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infrared Tiny Structureless Object detection Enhanced By Video Super-resolution

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IEEE Access 2025年 13卷 89983-89996页

作者： Mao, Duixu Chen, Xiaxu Xu, Linhan Ke, Jun Beijing Institute of Technology School of Optics and Photonics Beijing100081 China Ministry of Education of China Key Laboratory of Photo-electronic Imaging Technology and System Beijing100081 China National Key Laboratory on Near-surface Detection Beijing100072 China

The precise detection of infrared (IR) tiny objects against complex backgrounds is of great significance in the field of aircraft imaging guidance. However, due to the extremely small target features, low brightness, and the tendency to be submerged in complex backgrounds, the detection of IR tiny aerial targets remains a challenge. Concurrently, super-resolution technology is a novel technique that has emerged in recent years, aiming to enhance image quality without altering hardware specifications, thereby magnifying the characteristics of tiny targets. In light of this, we introduce infrared tiny object detection method enhanced by video super resolution. Our proposed method is a two-stage model. Initially, it enhances target features through bidirectional propagation and optical flow alignment within the super-resolution module. Subsequently, it employs restricted receptive field convolution and multi-receptive field feature fusion to enhance the detection accuracy of small targets. Experimental results demonstrate that our method has achieved state-of-the-art performance in the task of IR tiny target detection, with an F1 score of 0.957, an accuracy of 99.2%, and a recall rate of 92.4% on the SIATD dataset, outperforming the state-of-the-art by 2%. Furthermore, ablation studies confirm the significant contribution of super-resolution techniques in enhancing the performance of infrared tiny target detection. © 2013 IEEE.

关键词： Image resolution

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Orbital angular momentum spectrum diagnostic from a powermeter

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Optics Letters 2025年第11期50卷 3784-3787页

作者： Ruitao Lu Chunqing Gao Shiyao Fu School of Optics and Photonics Beijing Institute of Technology Beijing 100081 China Key Laboratory of Information Photonics Technology Ministry of Industry and Information Technology of the People’s Republic of China Beijing 100081 China Key Laboratory of Photoelectronic Imaging Technology and System Ministry of Education of the People’s Republic of China Beijing 100081 China National Key Laboratory on Near-Surface Detection Beijing 100072 China

Orbital angular momentum (OAM) spectrum is one of the identity characteristics of laser beams and determines the performance of OAM based advanced applications. Therefore, diagnosing the OAM spectrum of a beam is of great significance. In this Letter, we show that a common commercial powermeter, rather than an array detector such as the charge coupled device, can be employed to accurately measure OAM spectra for beams. In our proposal, a series of probe single OAM modes are introduced to interfere with the incident beam to be measured. Then, a power value sequence is measured through a powermeter. Finally, the OAM spectrum is acquired by analyzing the power value sequence. The favorable experimental results illustrate the effectiveness of our proposal, where the OAM spectra of both single-mode and multiplexed OAM beams are well diagnosed. This work provides a new, to the best of our knowledge, insight of the OAM spectrum diagnostics and is expected to reduce the cost of the measuring system, thereby facilitating the widespread and advanced application of OAM.

关键词： Charge-coupled devices Diffractive optical elements Laser beams Orbital angular momentum multiplexing Spatial light modulators Vertical cavity surface emitting lasers

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Wafer bow control of extended wavelength InGaAs photodetector materials by strain tailoring

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Materials Science in Semiconductor Processing 2025年 197卷

作者： Liu, Bowen Gu, Yi Yin, Lihao Huang, Huijuan Li, Kang Fan, Liuyan Zhou, Hong Chen, Pingping Yu, Chunlei Li, Tao Shao, Xiumei Li, Xue Gong, Haimei National Key Laboratory of Infrared Detection Technologies Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China Key Laboratory of Infrared Imaging Materials and Detectors Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China State Key Laboratory of Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China Wuxi Zhongke Dexin Sensing Technology Co. Ltd. Jiangsu Wuxi 214135 China University of Chinese Academy of Sciences Beijing 100049 China

The wafer bow caused by lattice mismatch between metamorphic InGaAs epitaxial layer and InP substrate has become one of the key factors limiting the large-scale development of extended wavelength InGaAs focal plane array photodetectors. By introducing tensile strain in InAlAs buffer layers and InAlAs cap layer to compensate the compressive strain caused by lattice mismatch, the wafer bow was decreased from 55.9 μm to 22.2 μm. The influence of strain compensation structure on the anisotropy of metamorphic InGaAs materials was investigated by stress distribution, surface morphology, and PL uniformity. XRD and PL characterizations indicate that small tensile strain in InAlAs buffer layers did not reduce the quality of metamorphic InGaAs epitaxial material. This study shows that strain compensation is an effective method to control wafer bow and decrease anisotropy of metamorphic InGaAs materials grown on InP substrate. © 2025

关键词： Anisotropy Metamorphic InGaAs photodetector materials Strain compensation Wafer bow

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An alternative application of GaAs-based light-emitting diodes: X-ray detection and imaging

arXiv

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arXiv 2025年

作者： Yu, Quan Wang, Fangbao Yuan, Xin Liu, Ying Gan, Lianghua Xu, Gangyi Shen, Wenzhong Chen, Liang Zhang, Yueheng Key Laboratory of Artificial Structures and Quantum Control School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China Radiation Detection Research Center Northwest Institute of Nuclear Technology Xi’an710024 China Key Laboratory of Infrared Imaging Materials and Detectors Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai200083 China Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Hangzhou310024 China

GaAs-based light-emitting diodes (LEDs) are commonly employed in a variety of applications, including medical imaging, biosensing, optical communications, and night vision. In this paper, we present an alternative application of GaAs-based LED with SI-GaAs substrate for X-ray detection and imaging. The mechanism relies on the semiconductor frequency down-conversion process, where the SI-GaAs substrate acts as a photodetector (PD). Upon X-ray irradiation, the generated photocurrent by the SI-GaAs substrate drives the LED to emit NIR photons which can be detect by a low-cost CCD. We demonstrate direct X-ray detection and present preliminary imaging results, providing another example of the applicability of the PD-LED design for optical frequency conversion. The proposed LED X-ray detector leverages mature materials and fabrication processes. The application of the frequency down-conversion concept makes it possible for pixel-less imaging using a large single imaging unit, eliminating the need for readout circuits. This PD-LED architecture offers an alternative approach to direct X-ray detection and imaging, characterized by higher absorption, improved image resolution, and enhanced material stability. Copyright © 2025, The Authors. All rights reserved.

关键词： III-V semiconductors

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Structural Damage detection and Localization Using Response Difference Transmissibility

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Journal of Shanghai Jiaotong university(Science) 2024年第6期29卷 1126-1138页

作者： WANG Zengwei DING Lei Shanghai Institute of Technical Physics Key Laboratory of Infrared System Detection and Imaging TechnologyChinese Academy of SciencesShanghai 200083China

In this paper,a novel method is proposed for structural damage detection and *** key of the proposed method is the use of the response difference transmissibility(RDT)for damage *** RDT is defined to relate response differences of the system to be evaluated and those of the original *** invariance properties of RDT are also *** on this,a damage indicator is proposed,and the benefits are verified by a numerical ***,the proposed method is illustrated and validated by finite element simulations and experimental case studies.

关键词： damage detection damage localization transmissibility mechanical vibrations

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A novel method of spike detection for interferograms based on two-step filtering

A novel method of spike detection for interferograms based o...

引用

4th International Conference on Frontiers of Manufacturing Science and Measuring technology, ICFMM 2014

作者： Zou, Yao Pu Han, Chang Pei Zhang, Lei Pan, Wen Gui Wang, Chao Key Laboratory of Infrared System Detection and Imaging Technology SITP UCAS China

ISBN: (纸本)9783038351924

According to the characteristics of interferogram, we design a new spike detection method, which firstly filters an interferogram with two different ways and then detects spikes based on both results. Theoretical analysis and computer simulation shows that this algorithm performs well in detecting spikes in any position of an interferogram with high accuracy, and can be easily implemented in hardware. © (2014) Trans Tech Publications, Switzerland.

关键词： Computer hardware

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A method to compensate the dead time for three-phase PWM inverters

A method to compensate the dead time for three-phase PWM inv...

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International Conference on Frontiers of Energy, Materials and Information Engineering, ICFMEI 2014

作者： Pan, Wen Gui Zhang, Lei Zou, Yao Pu Wang, Chao Han, Chang Pei Key Laboratory of Infrared System Detection and Imaging Technology SITP UCAS Shanghai China

ISBN: (纸本)9783038352778

As for a vector control of a permanent magnet synchronous motor, this paper analyzed the influence of dead-time effect of three-phase bridge inverters on output voltage and current in details. A novel on-line method was proposed for dead-time effect compensation based on disturbance observer. At last, the method is simulated using MATLAB and the simulation results proves the effectiveness and feasibility of the method presented. © (2014) Trans Tech Publications, Switzerland.

关键词： Pulse width modulation

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A design of on-board dual-channel data handling method based on two FPGAs 6

A design of on-board dual-channel data handling method based...

引用

6th International SpaceWire Conference, SpaceWire 2014

作者： Yaopu, Zou Jiayou, Jiang Changpei, Han Key Laboratory of Infrared System Detection and Imaging Technology Shanghai Institute of Technical Physics UCAS Shanghai China Key Laboratory of Infrared System Detection and Imaging Technology Shanghai Institute of Technical Physics CAS Shanghai China

ISBN: (纸本)9780955719653

SpaceWire is used on FY4 meteorological satellite as on-board data-handling network. Based on SpaceWire, this paper provides a design using two FPGAs and AT7911 chips for the dual-channel data processing of a payload on FY4 to ensure that data can be transported efficiently and reliably. This design has proved to be feasible when tested on the ground. © 2014 University of Dundee.

关键词： Data handling

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