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Racemic dielectric metasurfaces for arbitrary terahertz polarization rotation and wavefront manipulation

Opto-Electronic Advances 2024年第10期7卷 41-50页

作者： Jie Li Xueguang Lu Hui Li Chunyu Song Qi Tan Yu He Jingyu Liu Li Luo Tingting Tang Tingting Liu Hang Xu Shuyuan Xiao Wanxia Huang Yun Shen Yan Zhang Yating Zhang Jianquan Yao College of Optoelectronic Engineering Chengdu University of Information TechnologyChengdu 610225China School of Precision Instruments and Opto-Electronics Engineering Tianjin UniversityTianjin 300072China College of Materials Science and Engineering Sichuan UniversityChengdu 610065China School of Information Engineering Nanchang UniversityNanchang 330031China Department of Physics School of Physics and Materials ScienceNanchang UniversityNanchang 330031China Key Laboratory of Terahertz Optoelectronics Ministry of EducationDepartment of PhysicsCapital Normal UniversityBeijing 100048China.

dielectric chiral metasurface is a new type of planar and efficient chiral optical device that shows strong circular dichroism or optical activity,which has important application potential in optical sensing and ***,the two types of chiral optical responses in conventional chiral metasurfaces are often interdependent,as their modulation of the amplitudes and phases of orthogonal circularly polarized components is correlated,which limits the further progress of chiral *** we propose a new scheme for independently designing the circular dichroism and optical activity of chiral metasurfaces to further control the polarization and wavefront of transmitted *** by mixtures of chiral molecular isomers,we use the dielectric isomer resonators to form“super-units”instead of single meta-atoms for chiral responses in terahertz band,which is called racemic *** introducing two levels of Pancharatnam-Berry phases between meta-atoms and“super-units”,the polarization rotation angle and wavefront of the beam can be designed without the far-field circular *** demonstrate the strong control ability on terahertz waves of this scheme through simulation and *** addition,this new type of device with near-field chirality but no far-field circular dichroism may also have important value in optical sensing and other technologies.

关键词： racemic dielectric metasurfaces terahertz waves chirality

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A review of dielectric optical metasurfaces for spatial differentiation and edge detection

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Frontiers of Optoelectronics 2021年第2期14卷 187-200页

作者： Lei WAN Danping PAN Tianhua FENG Weiping LIU Alexander A.POTAPOV Department of Electronic Engineering College of Information Science and TechnologyJinan UniversityGuangzhou 510632China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China JNU-IREE RAS Joint Laboratory of Information Techniques and Fractal Signal Processing Jinan UniversityGuangzhou 510632China Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Education Institutes Jinan UniversityGuangzhou 510632China Institute of Radio Engineering and Electronics Russian Academy of SciencesMoscow 125009Russia

dielectric metasurfaces-based planar optical spatial differentiator and edge detection have recently been proposed to play an important role in the parallel and fast image processing *** the development of dielectric metasurfaces of different geometries and resonance mechanisms,diverse on-chip spatial differentiators have been proposed by tailoring the dispersion characteristics of subwavelength *** review focuses on the basic principles and characteristic parameters of dielectric metasurfaces as first-and second-order spatial differentiators realized via the Green's function *** spatial bandwidth and polarization dependence are emphasized as key properties by comparing the optical transfer flinctions of metasurfaces for different incident wavevectors and *** present the operational capabilities of a two-dimensional spatial differentiator in image information acquisition,edge detection is described to illustrate the practicability of the *** an application example,experimental demonstrations of edge detection for different biological cells and a flower mold are discussed,in which a spatial differentiator and objective lens or camera are integrated in three optical pathway *** realization of spatial differentiators and edge detection with dielectric metasurfaces provides new opportunities for ultrafast information identification in biological imaging and machine vision.

关键词： dielectric metasurfaces spatial differentiator edge detection optical transfer function

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Nonlinear optics in all-dielectric nanoantennas and metasurfaces:a review

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Advanced Photonics 2019年第2期1卷 20-33页

作者： Basudeb Sain Cedrik Meier Thomas Zentgraf University of Paderborn Department of PhysicsPaderbornGermany

Free from phase-matching constraints,plasmonic metasurfaces have contributed significantly to the control of optical nonlinearity and enhancement of nonlinear generation efficiency by engineering subwavelength ***,high dissipative losses and inevitable thermal heating limit their applicability in nonlinear ***-dielectric metasurfaces,supporting both electric and magnetic Mie-type resonances in their nanostructures,have appeared as a promising alternative to nonlinear ***-index dielectric nanostructures,allowing additional magnetic resonances,can induce magnetic nonlinear effects,which,along with electric nonlinearities,increase the nonlinear conversion *** addition,low dissipative losses and high damage thresholds provide an extra degree of freedom for operating at high pump intensities,resulting in a considerable enhancement of the nonlinear *** discuss the current state of the art in the intensely developing area of all-dielectric nonlinear nanostructures and metasurfaces,including the role of Mie modes,Fano resonances,and anapole moments for harmonic generation,wave mixing,and ultrafast optical ***,we review the recent progress in the nonlinear phase and wavefront control using all-dielectric *** discuss techniques to realize alldielectric metasurfaces for multifunctional applications and generation of second-order nonlinear processes from complementary metal–oxide–semiconductor-compatible materials.

关键词： nonlinear optics dielectric metasurfaces Mie modes Fano resonances anapole modes harmonic generation

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Dynamically controlling terahertz wavefronts with cascaded metasurfaces

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Advanced Photonics 2021年第3期3卷 93-102页

作者： Xiaodong Cai Rong Tang Haoyang Zhou Qiushi Li Shaojie Ma Dongyi Wang Tong Liu Xiaohui Ling Wei Tan Qiong He Shiyi Xiao Lei Zhou Shanghai University Key Laboratory of Specialty Fiber Optics and Optical Access NetworksJoint International Research Laboratory of Specialty Fiber Optics and Advanced CommunicationShanghai Institute for Advanced Communication and Data ScienceShanghaiChina Fudan University State Key Laboratory of Surface PhysicsKey Laboratory of Micro and Nano Photonic Structures(Ministry of Education)and Physics DepartmentShanghaiChina Hengyang Normal University College of Physics and Electronic EngineeringHengyangChina CAEP Microsystem and Terahertz Research CenterChengduChina CAEP Institute of Electronic EngineeringMianyangChina Fudan University Academy for Engineering and TechnologyShanghaiChina Collaborative Innovation Centre of Advanced Microstructures NanjingChina

Dynamically controlling terahertz(THz)wavefronts in a designable fashion is highly desired in ***,available methods working at microwave frequencies do not work well in the THz regime due to lacking suitable tunable elements with submicrometer ***,instead of locally controlling individual meta-atoms in a THz metasurface,we show that rotating different layers(each exhibiting a particular phase profile)in a cascaded metadevice at different speeds can dynamically change the effective Jonesmatrix property of the whole device,thus enabling extraordinary manipulations on the wavefront and polarization characteristics of a THz beam impinging on the *** illustrating our strategy based on model calculations,we experimentally demonstrate two proof-of-concept metadevices,each consisting of two carefully designed all-silicon transmissive metasurfaces exhibiting different phase *** two metasurfaces inside the fabricated devices at different speeds,we experimentally demonstrate that the first metadevice can efficiently redirect a normally incident THz beam to scan over a wide solid-angle range,while the second one can dynamically manipulate both the wavefront and polarization of a THz *** results pave the way to achieving dynamic control of THz beams,which is useful in many applications,such as THz radar,and bio-and chemical sensing and imaging.

关键词： terahertz beam-steering dielectric metasurfaces linear gradient phase

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Nonlinear chiral metaphotonics:a perspective

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Advanced Photonics 2023年第6期5卷 17-28页

作者： Kirill Koshelev Pavel Tonkaev Yuri Kivshar Australian National University Research School of PhysicsNonlinear Physics CenterCanberraAustralian Capital TerritoryAustralia

We review the physics and some applications of photonic structures designed for the realization of strong nonlinear chiroptical *** pay much attention to the recent strategy of utilizing different types of optical resonances in metallic and dielectric subwavelength structures and metasurfaces,including surface plasmon resonances,Mie resonances,lattice-guided modes,and bound states in the *** summarize earlier results and discuss more recent developments for achieving large circular dichroism combined with the high efficiency of nonlinear harmonic generation.

关键词： chirality metaphotonics dielectric metasurfaces plasmonic metasurfaces nonlinear optics bound states in the continuum

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Ultrahigh performance passive radiative cooling by hybrid polar dielectric metasurface thermal emitters

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Opto-Electronic Advances 2024年第4期7卷 17-25页

作者： Yinan Zhang Yinggang Chen Tong Wang Qian Zhu Min Gu Institute of Photonic Chips University of Shanghai for Science and TechnologyShanghai 200093China Centre for Artificial-Intelligence Nanophotonics School of Optical-Electrical and Computer EngineeringUniversity of Shanghai for Science and TechnologyShanghai 200093China

Real-world passive radiative cooling requires highly emissive,selective,and omnidirectional thermal emitters to maintain the radiative cooler at a certain temperature below the ambient temperature while maximizing the net cooling *** various selective thermal emitters have been demonstrated,it is still challenging to achieve these conditions sim-ultaneously because of the extreme difficulty in controlling thermal emission of photonic structures in *** we demonstrated hybrid polar dielectric metasurface thermal emitters with machine learning inverse design,en-abling a high emissivity of~0.92 within the atmospheric transparency window 8-13μm,a large spectral selectivity of~1.8 and a wide emission angle up to 80 degrees,*** selective and omnidirectional thermal emitter has led to a new record of temperature reduction as large as~15.4°C under strong solar irradiation of~800 W/m2,signific-antly surpassing the state-of-the-art *** designed structures also show great potential in tackling the urban heat island effect,with modelling results suggesting a large energy saving and deployment area *** research will make significant impact on passive radiative cooling,thermal energy photonics and tackling global climate change.

关键词： radiative cooling dielectric metasurfaces machine learning thermal emitters

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