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Metalenses phase characterization by multidistance phase retrieval

Light(Science & Applications) 2024年第9期13卷 1898-1907页

作者： Bowen Liu Jialuo cheng Maoxiong Zhao Jin Yao Xiaoyuan Liu Shaohu chen Lei Shi Din Ping Tsai Zihan Geng mu ku chen State Key Laboratory of Surface Physics Key Laboratory of Micro-and Nano-Photonic Structures(Ministry of Education)and Department of PhysicsFudan University200433 ShanghaiChina Department of Electrical Engineering City University of Hong KongKowloonHong Kong SARChina State Key Laboratory of Terahertz and Millimeter Waves City University of Hong KongKowloonHong Kong SARChina Institute for Nanoelectronic Devices and Quantum Computing Fudan University200438 ShanghaiChina Collaborative Innovation Center of Advanced Microstructures Nanjing University210093 NanjingJiangsuChina Shanghai Research Center for Quantum Sciences 201315 ShanghaiChina Centre for Biosystems Neuroscienceand NanotechnologyCity University of Hong KongKowloonHong Kong SARChina Institute of Data and Information Tsinghua Shenzhen International Graduate SchoolTsinghua University518071 ShenzhenGuangdongChina

Metalens,characterized by their unique functions and distinctive physical properties,have gained significant attention for their potential *** further optimize the performance of metalens,it is necessary to characterize the phase modulation of the *** this study,we present a multi-distance phase retrieval system based on optical field scanning and discuss its convergence and *** findings indicate that the system is capable of retrieving the phase distribution of the metalens as long as the measurement noise is low and the total length of the scanned light field is sufficiently *** system enables the analysis of focal length and aberration by utilizing the computed phase *** extend our investigation to measure the phase distribution of the metalens operating in the near-infrared(NIR)spectrum and identify the impact of defects in the sample on the ***,we conduct a comparative analysis of the phase distribution of the metalens in air and ethanol and observe the variations in the phase modulation of the metalens in different working *** system provides a straightforward method for the phase characterization of metalens,aiding in optimizing the metalens design and functionality.

关键词： phase system distribution

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Integrated-resonant metadevices:a review

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Advanced Photonics 2023年第2期5卷 7-33页

作者： Jin Yao Rong Lin mu ku chen Din Ping Tsai City University of Hong Kong Department of Electrical EngineeringHong KongChina City University of Hong Kong Centre for BiosystemsNeuroscienceand NanotechnologyHong KongChina City University of Hong Kong State Key Laboratory of Terahertz and Millimeter WavesHong KongChina

Integrated-resonant units(IRUs),associating various meta-atoms,resonant modes,and functionalities into one supercell,have been promising candidates for tailoring composite and multifunctional electromagnetic responses with additional degrees of ***-resonant metadevices can overcome many bottlenecks in conventional optical devices,such as broadband achromatism,efficiency enhancement,response selectivity,and continuous tunability,offering great potential for performant and versatile application *** focus on the recent progress of integrated-resonant *** from the design principle of IRUs,a variety of IRU-based characteristics and subsequent practical applications,including achromatic imaging,light-field sensing,polarization detection,orbital angular momentum generation,metaholography,nanoprinting,color routing,and nonlinear generation,are *** challenges in this field and opinions on future research directions are also provided.

关键词： integrated-resonant units metadevices metasurfaces nanophotonic devices planar optics

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Spectral tomographic imaging with aplanatic metalens

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Light(Science & Applications) 2019年第1期8卷 258-265页

作者： chen chen Wange Song Jia-Wern chen Jung-Hsi Wang Yu Han chen Beibei Xu mu-ku chen Hanmeng Li Bin Fang Ji chen Hsin Yu kuo Shuming Wang Din Ping Tsai Shining Zhu Tao Li National Laboratory of Solid State Microstructures Key Laboratory of Intelligent Optical Sensing and IntegrationJiangsu Key Laboratory of Artificial Functional MaterialsCollege of Engineering and Applied SciencesNanjing UniversityNanjing 210093China Collaborative Innovation Center of Advanced Microstructures NanjingChina Research Center for Applied Sciences Taipei11529 TaiwanChina Department of Physics Taiwan UniversityTaipei10617 TaiwanChina Graduate Institute of Electronics Engineering Taiwan UniversityTaipei10617 TaiwanChina

Tomography is an informative imaging modality that is usually implemented by mechanical scanning,owing to the limited depth-of-field(DOF)in conventional ***,recent imaging systems are working towards more compact and stable architectures;therefore,developing nonmotion tomography is highly ***,we propose a metalens-based spectral imaging system with an aplanatic GaN metalens(NA=0.78),in which large chromatic dispersion is used to access spectral focus tuning and optical zooming in the visible *** the function of wavelength-switched tomography was confirmed on cascaded samples,this aplanatic metalens is utilized to image microscopic frog egg cells and shows excellent tomographic images with distinct DOF features of the cell membrane and *** approach makes good use of the large diffractive dispersion of the metalens and develops a new imaging technique that advances recent informative optical devices.

关键词： tuning switched dispersion

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Phase characterisation of metalenses

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Light(Science & Applications) 2021年第4期10卷 551-561页

作者： Maoxiong Zhao mu ku chen Ze-Peng Zhuang Yiwen Zhang Ang chen Qinmiao chen Wenzhe Liu Jiajun Wang Ze-Ming chen Bo Wang Xiaohan Liu Haiwei Yin Shumin Xiao Lei Shi Jian-Wen Dong Jian Zi Din Ping Tsai State Key Laboratory of Surface Physics Key Laboratory of Micro-and Nano-Photonic Struaures(Ministry of Education)and Department of PhysicsFudan University200433 ShanghaiChina Department of Electronic and Information Engineering The Hong Kong Polytechnic University999077 Hong KongChina School of Physics and State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-sen University510275 GuangzhouChina Shanghai Engineering Research Center of Optical Metrology for Nanofabrication(SERCOM) 200433 ShanghaiChina State Key Laboratory on Tunable Laser Technology Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information SystemShenzhen Graduate SchoolHarbin Institute of Technology518055 ShenzhenChina

Metalenses have emerged as a new optical element or system in recent years,showing superior performance and abundant ***,the phase distribution of a metalens has not been measured directly up to now,hindering further quantitative evaluation of its *** have developed an interferometric imaging phase measurement system to measure the phase distribution of a metalens by taking only one photo of the interference *** on the measured phase distribution,we analyse the negative chromatic aberration effect of monochromatic metalenses and propose a feature size of *** sensitivities of the phase response to wavelength between the Pancharatnam-Berry phase-based metalens and propagation phase-reliant metalens are directly observed in the ***,through phase distribution analysis,it is found that the distance between the measured metalens and the brightest spot of focusing will deviate from the focal length when the metalens has a low nominal numerical aperture,even though the metalens is ideal without any fabrication *** also use the measured phase distribution to quantitatively characterise the imaging performance of the *** phase measurement system will help not only designers optimise the designs of metalenses but also fabricants distinguish defects to improve the fabrication process,which will pave the way for metalenses in industrial applications.

关键词： character distribution nominal

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Electromagnetic Wave Tailoring:From One Dimension to multiple Dimensions

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Electromagnetic Science 2023年第3期1卷 1-21页

作者： Jing cheng Zhang Geng-Bo Wu mu ku chen Xiaoyu Che Yao Liang Din Ping Tsai Chi Hou Chan Department of Electrical Engineering City University of Hong KongHong Kong SAR 999077China State Key Laboratory of Terahertz and Millimeter Waves City University of Hong KongHong Kong SAR 999077China Centre for Biosystems Neuroscienceand NanotechnologyCity University of Hong KongHong Kong SAR 999077China

Metasurfaces,known as arrays of subwavelength antennas,provide a wide range of options for controlling electromagnetic waves and effectively reducing the size and complexity of electromagnetic *** can manipulate five degrees of freedom of electromagnetic waves:amplitude,wavelength,polarization,phase,and orbital angular momentum;these are customized to provide a variety of remarkable functionalities,including metalenses and *** the advancement of simultaneously manipulating two or more degrees of freedom of the electromagnetic field,there has been a significant increase in the amount of information that electromagnetic waves can *** wavefront can be precisely tailored for specific applications,facilitating new possibilities for innovative applications with high performance and diverse functionalities,such as full-color vectorial meta-holograms achieved by a single-layer *** review briefly overviews the latest developments in metasurfaces,categorizing them based on their various degrees of freedom used to manipulate the electromagnetic *** use of metasurfaces to control electromagnetic waves from one dimension to multiple dimensions is systematically *** challenges and opportunities for future research are discussed.

关键词： Electromagnetic wave manipulation Metasurfaces Single-dimensional manipulation multidimensional manipulation.

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Miniature tunable Airy beam optical meta-device

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Opto-Electronic Advances 2024年第2期7卷 5-12页

作者： Jing cheng Zhang mu ku chen Yubin Fan Qinmiao chen Shufan chen Jin Yao Xiaoyuan Liu Shumin Xiao Din Ping Tsai Department of Electrical Engineering City University of Hong KongKowloonHong Kong SAR 999077China State Key Laboratory of Terahertz and Millimeter Waves City University of Hong KongKowloonHong Kong SAR 999077China Centre for Biosystems Neuroscienceand NanotechnologyCity University of Hong KongKowloonHong Kong SAR 999077China Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic SystemsHarbin Institute of TechnologyShenzhen 518055China

Tunable Airy beams with controllable propagation trajectories have sparked interest in various fields,such as optical manipulation and laser *** research approaches encounter challenges related to insufficient compactness and integration feasibility,or they require enhanced tunability to enable real-time dynamic manipulation of the propagation *** this work,we present a novel method that utilizes a dual metasurface system to surpass these limitations,significantly enhancing the practical potential of the Airy *** approach involves encoding a cubic phase profile and two off-axis Fresnel lens phase profiles across the two *** validity of the proposed strategy has been confirmed through simulation and experimental *** proposed meta-device addresses the existing limitations and lays the foundation for broadening the applicability of Airy beams across diverse domains,encompassing light-sheet microscopy,laser fabrication,optical tweezers,etc.

关键词： metasurface miniature device tunable Airy beam tunable meta-device

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Plasmonic anapole metamaterial for refractive index sensing

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PhotoniX 2022年第1期3卷 116-125页

作者： Jin Yao Jun-Yu Ou Vassili Savinov mu ku chen Hsin Yu kuo Nikolay I.Zheludev Din Ping Tsai Department of Electrical Engineering City University of Hong KongKowloonHong Kong SARChina Optoelectronics Research Centre Centre for Photonic MetamaterialsUniversity of SouthamptonSO171BJ HighfieldSouthamptonUK Centre for Biosystems Neuroscienceand NanotechnologyCity University of Hong KongKowloonHong Kong SARChina The State Key Laboratory of Terahertz and Millimeter Waves City University of Hong KongKowloonHong Kong SARChina Centre for Disruptive Photonic Technologies SPMSNanyang Technological University637371 SingaporeTPISingapore

Electromagnetic anapole mode is a nonradiative state of light originating from the deconstructive interference of radiation of the oscillating electric and toroidal dipole *** high quality anapole-related resonances can be used in enhancing nonlinear electromagnetic properties of materials and in sensor *** this work,we experimentally demonstrate plasmonic anapole metamaterial sensor of environmental refractive index in the optical part of the *** results show that the sensor exhibits high sensitivity to the ambient refractive index at the level of 330 nm/RIU and noise floor of 8.7×10^(-5)*** work will pave the way for applications of anapole metamaterials in biosensing and spectroscopy.

关键词： Plasmonic metamaterial Electromagnetic anapole Refractive index sensor Vertical split-ring resonator Toroidal dipole

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Plasmonic bound states in the continuum for unpolarized weak spatially coherent light

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Photonics Research 2023年第2期11卷 260-269页

作者： ZHUO WANG YAO LIANG JIAQI QU mu ku chen MINGJIE CUI ZHI chenG JINGchenG ZHANG JIN YAO SHUFAN chen DIN PING TSAI CHANGYUAN YU Photonics Research Institute Department of Electrical EngineeringThe Hong Kong Polytechnic UniversityKowloonHong KongChina Department of Electrical Engineering Centre for BiosystemsNeuroscienceand NanotechnologyCity University of Hong KongKowloonHong KongChina State Key Laboratory of Terahertz and Millimeter Waves City University of Hong KongKowloonHong KongChina Photonics Research Institute Department of Electronic and Information EngineeringThe Hong Kong Polytechnic UniversityKowloonHong KongChina

Plasmonic resonances empowered by bound states in the continuum(BICs) offer unprecedented opportunities to tailor light–matter interaction. However, excitation of high quality-factor(Q-factor) quasi-BICs is often limited to collimated light at specific polarization and incident directions, rendering challenges for unpolarized focused light. The major hurdle is the lack of robustness against weak spatial coherence and poor polarization of incident light. Here, addressing this limitation, we demonstrate sharp resonances in symmetric plasmonic metasurfaces by exploiting BICs in the parameter space, offering ultraweak angular dispersion effect and polarization-independent performance. Specifically, a high-Q(≈71) resonance with near-perfect absorption(>90%) is obtained for the input of unpolarized focused light covering wide incident angles(from 0° to 30°). Also, giant electric and magnetic field enhancement simultaneously occurs in quasi-BICs. These results provide a way to achieve efficient near-field enhancement using focused light produced by high numerical aperture objectives.

关键词： polarized incident continuum

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Metalenses for revolutionary imaging

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Photonics Insights 2023年第1期2卷 144-145页

作者： mu ku chen Takuo Tanaka Department of Electrical Engineering City University of Hong KongHong KongChina Innovative Photon Manipulation Research Team RIKEN Center for Advanced PhotonicsSaitamaJapan Metamaterial Laboratory RIKEN Cluster for Pioneering ResearchSaitamaJapan Institute of Post-LED Photonics Tokushima UniversityTokushimaJapan

Imaging tasks are becoming increasingly complex due to continuous high-tech advancements and the proliferation of personal *** the high-resolution displays on our smartphones and laptops to advancedmedical imaging systems,imaging systems are constantly being pushed to their *** complexity increases,more advanced optics are required.

关键词： becoming optics evolutionary

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Edge enhanced depth perception with binocular meta-lens

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Opto-Electronic Science 2024年第9期3卷 4-13页

作者： Xiaoyuan Liu Jingcheng Zhang Borui Leng Yin Zhou Jialuo cheng Takeshi Yamaguchi Takuo Tanaka mu ku chen Department of Electrical Engineering City University of Hong KongHong Kong SAR 999077China Centre for Biosystems Neuroscienceand NanotechnologyCity University of Hong KongHong Kong SAR 999077China The State Key Laboratory of Terahertz and Millimeter Waves and NanotechnologyCity University of Hong KongHong Kong SAR 999077China Innovative Photon Manipulation Research Team RIKEN Center for Advanced Photonics351-0198Japan Metamaterial Laboratory RIKEN Cluster for Pioneering Research351-0198Japan Institute of Post-LED Photonics Tokushima University770-8506Japan

The increasing popularity of the metaverse has led to a growing interest and market size in spatial computing from both academia and *** portable and accurate imaging and depth sensing systems is crucial for advancing next-generation virtual reality *** work demonstrates an intelligent,lightweight,and compact edge-enhanced depth perception system that utilizes a binocular meta-lens for spatial *** miniaturized system comprises a binocular meta-lens,a 532 nm filter,and a CMOS *** disparity computation,we propose a stereo-matching neural network with a novel *** H-Module incorporates an attention mechanism into the Siamese *** symmetric architecture,with cross-pixel interaction and cross-view interaction,enables a more comprehensive analysis of contextual information in stereo *** on spatial intensity discontinuity,the edge enhancement eliminates illposed regions in the image where ambiguous depth predictions may occur due to a lack of *** the assistance of deep learning,our edge-enhanced system provides prompt responses in less than 0.15 *** edge-enhanced depth perception meta-lens imaging system will significantly contribute to accurate 3D scene modeling,machine vision,autonomous driving,and robotics development.

关键词： metasurfaces meta-lenses deep learning depth perception edge detection

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