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When optical microscopy meets all-optical analog computing:A brief review

Frontiers of physics 2023年第4期18卷 249-264页

作者： Yichang Shou Jiawei Liu Hailu Luo Laboratory for Spin Photonics School of Physics and ElectronicsHunan UniversityChangsha 410082China

As a revolutionary observation tool in life science,biomedical,and material science,optical microscopy allows imaging of samples with high spatial resolution and a wide field of ***,conventional microscopy methods are limited to single imaging and cannot accomplish real-time image *** edge detection,image enhancement and phase visualization schemes have attracted great interest with the rapid development of optical analog *** two main physical mechanisms that enable optical analog computing originate from two geometric phases:the spin-redirection Rytov-Vlasimirskii-Berry(RVB)phase and the Pancharatnam-Berry(PB)***,we review the basic principles and recent research progress of the RVB phase and PB phase based optical *** we focus on the innovative and emerging applications of optical analog computing in microscopic *** analog computing is accelerating the transformation of information processing from classical imaging to quantum *** intersection with optical microscopy opens opportunities for the development of versatile and compact optical microscopy systems.

关键词： optical microscopy optical analog computing all-optical image processing

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optical analog computing for salient object detection in complex scenes via dielectric metasurface

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PHYSICS LETTERS A 2024年 525卷

作者： Yang, Xu Wang, Di Ren, He Zhou, Shuai Wang, Zhile Chen, Shouqian Harbin Inst Technol Res Ctr Space Opt Engn Harbin 150001 Heilongjiang Peoples R China

optical analog computing overcomes the throughput and computational speed limitations of traditional digital computing, facilitating salient object detection on platforms that rapidly process massive image data, such as optical remote sensing. Further device miniaturization and integration can be achieved by replacing filters in optical analog computing with metasurface. Based on the combination of optical analog computing and dielectric metasurface, we proposed an optical analog cross-correlation operation operating in the mid-infrared wavelength band to achieve the real-time and compact salient object detection. Even in extremely complex scenes, this crosscorrelation operation can be used to identify and segment target patterns based on several target features accurately. The proposed optical analog cross-correlation operation may find applications in object tracking, medical image segmentation, and person re-identification.

关键词： Salient object detection optical analog computing Dielectric metasurface optical image processing

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Off-Resonance Spin-Locked Metasurfaces Empowered by Quasi-Bound States in the Continuum for optical analog computing

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ADVANCED FUNCTIONAL MATERIALS 2023年第47期33卷 2305110-2305110页

作者： Yang, Haochen Chen, Xuan Wu, Enzong Tang, Peng Jing, Liqiao Gao, Fei Chen, Hongsheng Wang, Zuojia Zhejiang Univ Interdisciplinary Ctr Quantum Informat ZJU Hangzhou Global Sci & Technol Innovat Ctr State Key Lab Extreme Photon & Instrumentat Hangzhou 310027 Peoples R China Zhejiang Univ Electromagnet Acad Int Joint Innovat Ctr Haining 314400 Peoples R China Zhejiang Univ Jinhua Inst Key Lab Adv Micro Nano Elect Devices & Smart Syst Jinhua 321099 Peoples R China Zhejiang Univ Shaoxing Inst Shaoxing 312000 Peoples R China

Metasurfaces with engineered phase discontinuity offer extra degrees of freedom to control the angular spectrum characteristics of light and can be used to construct planar metalenses with a variety of anomalous functionalities. Here, off-resonance spin-locked metasurfaces empowered by quasi-bound states in the continuum are reported, in order to achieve a concept of hybridized analog computing over both frequency and angular spectrum domains. By introducing two types of asymmetric degrees, high-quality resonance empowered by the symmetry-protected bound states in the continuum emerges in an image-coupled resonance system. Such high-quality resonance can be excited in a broadband spin-locked scattering spectrum, promising required functions for scalar multiplication and convolution operations. Off-resonance meta-splitter and meta-deflector are experimentally implemented to verify the concept of hybridized analog computing in two domains, as well as providing an advantage of high robustness against scattering interference from environment. optical spatial-frequency processing by engineering the off-resonance metasurfaces is also discussed. The findings provide an alternative approach toward optical analog computing over multi-domains.

关键词： off-resonance metasurfaces optical analog computing quasi-bound states in the continuum spin-locked scattering

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Meta-optics for spatial optical analog computing

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NANOPHOTONICS 2020年第13期9卷 4075-4095页

作者： Abdollahramezani, Sajjad Hemmatyar, Omid Adibi, Ali Georgia Inst Technol Sch Elect & Comp Engn 778 Atlantic Dr NW Atlanta GA 30332 USA

Rapidly growing demands for high-performance computing, powerful data processing, and big data necessitate the advent of novel optical devices to perform demanding computing processes effectively. Due to its unprecedented growth in the past two decades, the field of meta-optics offers a viable solution for spatially, spectrally, and/or even temporally sculpting amplitude, phase, polarization, and/or dispersion of optical wavefronts. In this review, we discuss state-of-the-art developments, as well as emerging trends, in computational metastructures as disruptive platforms for spatial optical analog computation. Two fundamental approaches based on general concepts of spatial Fourier transformation and Green's function (GF) are discussed in detail. Moreover, numerical investigations and experimental demonstrations of computational optical surfaces and metastructures for solving a diverse set of mathematical problems (e.g., integrodifferentiation and convolution equations) necessary for on-demand information processing (e.g., edge detection) are reviewed. Finally, we explore the current challenges and the potential resolutions in computational meta-optics followed by our perspective on future research directions and possible developments in this promising area.

关键词： edge sensing Fourier transformation Green's function metasurfaces optical analog computing

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optical cross-correlation analog computing based on dielectric metasurface at mid-infrared wavelengths

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OPTICS COMMUNICATIONS 2024年 569卷

作者： Yang, Xu Wang, Di Ren, He Zhou, Shuai Wang, Zhile Chen, Shouqian Harbin Inst Technol Res Ctr Space Opt Engn Harbin 150001 Heilongjiang Peoples R China

Compared to inefficient, energy-intensive digital computing, optical analog computing has significant advantages in terms of computational speed and power consumption. Traditional optical analog computing is typically based on Fourier lenses and spatial frequency filters, which are bulky and difficult to integrate. These disadvantages can be overcome by replacing Fourier lenses and spatial frequency filters in traditional optical analog computing via a metasurface. We showcase a real-time compact optical cross-correlation analog computing based on a dielectric metasurface. An extra phase profile is introduced in the metasurface to approximate the Fresnel diffraction integral as the Fourier transform to realize a more compact scheme. The optical crosscorrelation analog computing is derived by directly modulating the impinging optical field. A reference circular pattern of a circular target is highlighted recognized and identified by the operation. The recognition accuracy was analyzed by comparing the recognition peaks with the shifted center of the circle, showing that the operation is affected by the side flap of the other circle pattern in the background. optical analog computing with a compact and powerful kernel may find potential solutions for bio-detection, pattern recognition, information retrieval, and electron tomography.

关键词： optical analog computing Cross-correlation Dielectric metasurface Pattern recognition

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All-optical analog differential operation and information processing empowered by meta-devices

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NANOPHOTONICS 2025年第8期14卷 1021-1044页

作者： Zhou, Chen Wang, Yongtian Huang, Lingling Beijing Inst Technol Beijing Engn Res Ctr Mixed Real & Adv Display Sch Opt & Photon MIIT Key Lab Photon Informat Technol Beijing 100081 Peoples R China Natl Key Lab Near Surface Detect Beijing 100072 Peoples R China

The burgeoning demand for high-performance computing, robust data processing, and rapid growth of big data necessitates the emergence of novel optical devices to efficiently execute demanding computational processes. The field of meta-devices, such as metamaterial or metasurface, has experienced unprecedented growth over the past two decades. By manipulating the amplitude, phase, polarization, and dispersion of light wavefronts in spatial, spectral, and temporal domains, viable solutions for the implementation of all-optical analog computation and information processing have been provided. In this review, we summarize the latest developments and emerging trends of computational meta-devices as innovative platforms for spatial optical analog differentiators and information processing. Based on the general concepts of spatial Fourier transform and Green's function, we analyze the physical mechanisms of meta-devices in the application of amplitude differentiation, phase differentiation, and temporal differentiation and summarize their applications in image edge detection, image edge enhancement, and beam shaping. Finally, we explore the current challenges and potential solutions in optical analog differentiators and provide perspectives on future research directions and possible developments.

关键词： optical analog computing metasurface edge detection edge enhancement

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Ultra-high NA optical image differentiator based on dielectric metasurfaces

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OPTICS COMMUNICATIONS 2024年 552卷

作者： Chen, Huanchao Feng, Xiaobing Xu, Bingquan Huang, Guiqiong Qiu, Jian Luo, Kaiqing Peng, Li Liu, Dongmei Han, Peng South China Normal Univ Sch Phys & Telecommun Guangzhou 510006 Peoples R China South China Normal Univ Sch Elect & Informat Engn Foshan 528225 Peoples R China Sch South China Normal Univ Guangdong Prov Engn Res Ctr Optoelect Instrument Foshan 528225 Guangdong Peoples R China Guangzhou Railway Polytech Guangzhou 510430 Peoples R China

Metasurface-based optical differentiators have recently attracted attention for their potential advantages in real-time and high-throughput image processing technology. However, the existing differentiators suffer from limitations in numerical aperture (NA). Here, we propose a differential metasurface based on silicon clusters covered with polydimethylsiloxane, achieving a remarkable NA of 0.7. We numerically demonstrate the proposed differentiator can perform second-order differentiation on a 1D spatial function and high NA can accurately compute smaller-scale variations. We further demonstrate its ability to achieve edge detection on 2D images. Our results advance the development of ultra-high numerical aperture optical differentiator and provide new opportunities for image processing.

关键词： optical analog computing optical differentiator Edge detection Differential metasurface optical device

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optical edge-enhanced imaging based on dielectric metasurfaces

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optical MATERIALS 2023年第1期143卷

作者： Li, Zhixi Shang, Sihui Wu, Hao Liao, Wei Tang, Feng Wu, Jingjun Zeng, Tixian Kong, Bo Ye, Xin Jiang, Xiaodong Yang, Liming China Acad Engn Phys Res Ctr Laser Fus Mianyang 621900 Peoples R China China West Normal Univ Sch Phys & Astron Nanchong 637002 Peoples R China Chengdu Univ Informat Technol Coll Optoelect Technol Chengdu 610225 Peoples R China Southwest Univ Sci & Technol Sch Informat Engn Mianyang 621010 Peoples R China China Acad Engn Phys Laser Fus Res Ctr Micronano opt Mianyang 621900 Sichuan Peoples R China

optical edge-enhanced imaging is an effective method for boundary extraction, and it is also a cutting-edge technology for object detection in image processing. With the rapid development of metamaterial and meta -surface fields, the miniaturization and lightweight of optical devices have reached a new scale. At present, the experimental research of optical edge-enhanced imaging using metasurface is insufficient and lags behind the theoretical research. In this paper, we propose optical edge-enhanced imaging based on a Huygens phase met-asurface in the near-infrared (NIR). The entire optical edge-enhanced process is simulated, and the feasibility of the method is verified theoretically. Then, the edge-enhanced of numbers, letters, and biological tissues is carried out experimentally, and the results are consistent with the simulation results. This study proposes a near-infrared dielectric metasurface-based edge-enhanced imaging that can find important applications in compact optical platforms such as image processing.

关键词： Metasurface Edge -enhanced imaging optical analog computing Near -infrared

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Metasurface-Based Quantum Searcher on a Silicon-On-Insulator Chip

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MICROMACHINES 2022年第8期13卷 1204-1204页

作者： Wei, Zeyong Li, Haoyu Dou, Linyuan Xie, Lingyun Wang, Zhanshan Cheng, Xinbin Tongji Univ Sch Phys Sci & Engn Inst Precis Opt Engn Shanghai 200092 Peoples R China Tongji Univ MOE Key Lab Adv Microstruct Mat Shanghai 200092 Peoples R China Tongji Univ Shanghai Frontiers Sci Res Base Digital Opt Shanghai 200092 Peoples R China

optical analog computing has natural advantages of parallel computation, high speed and low energy consumption over traditional digital computing. To date, research in the field of on-chip optical analog computing has mainly focused on classical mathematical operations. Despite the advantages of quantum computing, on-chip quantum analog devices based on metasurfaces have not been demonstrated so far. In this work, based on a silicon-on-insulator (SOI) platform, we illustrated an on-chip quantum searcher with a characteristic size of 60 x 20 mu m(2). We applied classical waves to simulate the quantum search algorithm based on the superposition principle and interference effect, while combining it with an on-chip metasurface to realize modulation capability. The marked items are found when the incident waves are focused on the marked positions, which is precisely the same as the efficiency of the quantum search algorithm. The proposed on-chip quantum searcher facilitates the miniaturization and integration of wave-based signal processing systems.

关键词： metasurface on-chip optical analog computing quantum search algorithm

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A simple three-layer dielectric structure for spatiotemporal differentiation of optical signals 7

A simple three-layer dielectric structure for spatiotemporal...

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Conference on Nanophotonics VII

作者： Golovastikov, Nikita V. Bykov, Dmitry A. Bezus, Evgeni A. Doskolovich, Leonid L. Russian Acad Sci Image Proc Syst Inst Branch Fed Sci Res Ctr Crystallog & Photon 151 Molodogvardeyskaya St Samara 443001 Russia Samara Natl Res Univ 34 Moskovskoe Shosse Samara 443086 Russia

ISBN: (数字)9781510618718

ISBN: (纸本)9781510618718

We propose a horizontally symmetrical three-layer dielectric structure composed of a high-index central (core) layer surrounded by two identical low-index cladding layers, which acts as an optical differentiator in reflection. If the refractive index of the surrounding medium is greater that the refractive index of the cladding layers, the spectra of the considered structure may exhibit resonant features associated with the excitation of a leaky mode localized at the central layer. At resonant conditions, the reflection coefficient will vanish at certain values of frequency and angle of incidence, which enables the differentiation of the incident optical pulse. We theoretically justify that this three-layer structure can perform temporal differentiation (differentiation of an incident optical pulse envelope), spatial differentiation (differentiation of an optical beam profile) and the so-called "spatiotemporal differentiation" (differentiation of an optical signal envelope along a certain direction in the (x,t)-plane). Rigorous numerical simulation results demonstrate high quality of differentiation. It is shown that the resonance quality factor increases with the increase in the thickness of the cladding layers, which makes it possible to achieve a required linearity interval of the differentiating filter. The proposed differentiator is more compact than Fourier correlators containing graded-index lenses and substantially easier to fabricate than metasurface-based devices incorporating periodically arranged nanoresonators and may find application in ultrafast analogue computing and signal processing systems.

关键词： optical analog computing optical differentiation pulse shaping laser beam shaping resonance

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