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Temperature-adaptive metasurface radiative cooling device with excellent emittance and low solar absorptance for dynamic thermal regulation

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Advanced photonics 2024年第4期6卷 70-82页

作者： Junlin Yang Qianyi Li Shiqiao Liu Debao Fang Jingyao Zhang Haibo Jin Jingbo Li Beijing institute of Technology School of Materials Science and Engineering Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications

Passive radiative cooling is a promising passive cooling technology that emits heat to deep space without energy consumption. Nevertheless, the persistent challenge of overcooling in static radiative techniques has raised concerns. Although a desirable solution is suggested based on vanadium dioxide（VO2）in the form of a Fabry–Perot（F–P） resonant cavity, the inherent contradiction between desired high emissivity（ε） and low solar absorptance(αsol) remains a notable limitation. Here, we employed a simple mask-filling technique to develop a temperature-adaptive metasurface radiative cooling device（ATMRD） for dynamic thermal regulation. Simulation and experimental results substantially evidenced that multiple localized polariton resonances were induced by the VO2metasurface, significantly enhancing the thermal emittance of the ATMRDs. The engineered ATMRD achieved an amazing switch of the atmospheric window emittance from 0.13 to 0.85 when the surface temperature exceeds a pre-set transition temperature, accompanied by a commendable αsolof 27.71%. The mechanism of multiple localized polariton resonances is discussed in detail to understand the enhanced performance based on the investigation of the relationship between the metasurface structure and multiple localized polariton resonances. We demonstrate an efficient smart radiative technique achieved by a simple micro/nanoprocess and, most importantly, contribute a valuable reference for the design of radiative devices, which is crucial in various areas such as passive cooling,smart windows, multifunctional electromagnetic response, and space application technologies.

关键词： dynamic radiative cooling emittance metasurface plasmon resonance vanadium dioxide

Electronic structure engineering of single atomic sites by plasmoninduced hot electrons for highly efficient and selective photocatalysis

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Nano Research 2024年第8期17卷 6960-6967页

作者： Xiaoya Huang Xinyuan Li Akang Chen Hongfei Gu Shouyuan Li Tailei Hou Shuwen Zhu Shuang Yu Yin Song Jiatao Zhang Beijing Key laboratory of Construction Tailorable Advanced functional materials and Green Applications MIIT Key Laboratory of Medical Molecule Science and Pharmaceutical EngineeringMOE Key Laboratory of Cluster ScienceSchool of Chemistry and Chemical EngineeringSchool of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China MIIT Key laboratory of Complex-field Intelligent Exploration School of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China

Single atom(SA)catalysts have achieved great success on highly selective heterogeneous catalysis due to their abundant and homogeneous active *** electronic structures of these active sites,restrained by their localized coordination environments,significantly determine their catalytic performances,which are difficult to ***,we investigated the effect of localized surface plasmon resonance(LSPR)on engineering the electronic structures of single atomic ***,core–shell structures consisted of Au core and transition metal SAs loaded N-doped carbon(CN)shell were constructed,namely Au@M-SA/CN(M=Ni,Fe,and Co).It was demonstrated that plasmon-induced hot electrons originated from Au were directionally injected to the M-SAs under visible light irradiation,which significantly changed their electronic structures and meanwhile facilitated improved overall charge separation *** as-prepared Au@Ni-SA/CN exhibited highly efficient and selective photocatalytic CO_(2) reduction to CO performance,which is 20.8,17.5,and 6.9 times those of Au nanoparticles,Au@CN,and Ni-SA/CN,*** spectroscopy analysis and theoretical calculations confirmed that the plasmon enhanced Ni-SA/CN sites featured increased charge density for efficient intermediate activation,contributing to the superb photocatalytic *** work provides a new insight on plasmon and atomic site engineering for efficient and selective catalysis.

关键词： single atom catalysts plasmon enhancement coupling effect photocatalysis CO_(2) reduction

Vacancy defect MoSeTe embedded in N and F co-doped carbon skeleton for high performance sodium ion batteries and hybrid capacitors

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Journal of Energy Chemistry 2024年第3期90卷 652-664,I0014页

作者： Dehui Yang Wentao Guo Fei Guo Jiaming Zhu Gang Wang Hui Wang Guanghui Yuan Shenghua Ma Beibei Wang State Key laboratory of Photon-Technology in Western China Energy International Collaborative Center on Photoelectric Technology and Nano Functional MaterialsInstitute of Photonics&Photon-TechnologyNorthwest UniversityXi’an 710127ShannxiChina Key laboratory of Synthetic and Natural functional Molecule Chemistry(Ministry of Education) College of Chemistry&Materials ScienceNorthwest UniversityXi’an 710127ShannxiChina School of Chemistry and Chemical Engineering Ankang Research Centre of New Nano-materials Science and TechnologyShaanxi University Innovation Research Institute of Advanced Energy Storage Materials and Battery Technology for Future IndustrializationAnkang UniversityAnkang 725000ShannxiChina

Sodium-ion batteries(SIBs) and hybrid capacitors(SIHCs) have garnered significant attention in energy storage due to their inherent advantages,including high energy density,cost-effectiveness,and enhanced ***,developing high-performance anode materials to improve sodium storage performa nce still remains a major ***,a facile one-pot method has been developed to fabricate a hybrid of MoSeTe nanosheets implanted within the N,F co-doped honeycomb carbon skeleton(MoSeTe/N,F@C).Experimental results demonstrate that the incorporation of large-sized Te atoms into MoSeTe nanosheets enlarges the layer spacing and creates abundant anion vacancies,which effectively facilitate the insertion/extraction of Na^(+) and provide numerous ion adsorption sites for rapid surface capacitive ***,the heteroatoms N,F co-doped honeycomb carbon skeleton with a highly conductive network can restrain the volume expansion and boost reaction kinetics within the *** anticipated,the MoSeTe/N,F@C anode exhibits high reversible capacities along with exceptional cycle *** coupled with Na_(3)V_(2)(PO_(4))_(3)@C(NVPF@C) to form SIB full cells,the anode delivers a reversible specific capacity of 126 mA h g^(-1) after 100 cycles at 0.1 A g^(-1).Furthermore,when combined with AC to form SIHC full cells,the anode demonstrates excellent cycling stability with a reversible specific capacity of50 mA h g^(-1) keeping over 3700 cycles at 1.0 A g^(-1).In situ XRD,ex situ TEM characterization,and theoretical calculations(DFT) further confirm the reversibility of sodium storage in MoSeTe/N,F@C anode materials during electrochemical reactions,highlighting their potential for widespread practical *** work provides new insights into the promising utilization of advanced transition metal dichalcogenides as anode materials for Na^(+)-based energy storage devices.

关键词： MoSeTe N F co-doped honeycomb carbon skeleton Sodium-ion batteries Sodium-ion hybrid capacitor

Plasmon-enhanced self-powered GaN/ZnTe core/shell nanopillar array photodetector

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Nano Research 2024年第6期17卷 5569-5577页

作者： Jianqi Dong Dongqi Zhang Yi Ma Daotong You Jinping Chen Bin Liu Xingfu Wang Zengliang Shi Chunxiang Xu State Key laboratory of Digital Medical Engineering School of Biological Science and Medical EngineeringSoutheast UniversityNanjing 210096China Jiangsu Provincial Key laboratory of Advanced Photonic and Electronic materials National Laboratory of Solid State MicrostructuresSchool of Electronic Science and EngineeringNanjing UniversityNanjing 210093China institute of photonics Technology Jinan UniversityGuangzhou 510632China Guangdong Engineering Research Center of Optoelectronic functional materials and Devices Institute of SemiconductorsSouth China Normal UniversityGuangzhou 510631China

Nanostructure photodetectors,as the core component of optoelectronic devices,are mainly focused on the precise preparation of mixed-component nano-heterostructures and the realization of zero power consumption ***,we successfully fabricated n-GaN/p-ZnTe core/shell nanopillar array and realized self-power ultraviolet/violet *** radial heterojunction nanodevice reveals high light-dark current ratio of 104 at 0 V bias,indicating effective carriers’*** more,by integrating plasmonic effect,the responsivity and detectivity of the Au nanoparticles decorated device are increased from 3.85 to 148.83 mA/W and 4.45×1011 to 2.33×1012 Jones under 325 nm UV light *** the rise and the fall time are decreased 1.3 times and 6.8 times under 520 nm visible light irradiation at 0 V *** high photocurrent gain is derived from that the oscillating high-energy hot electrons in Au nanoparticles spontaneously inject into the ZnTe conduction band to involve the photodetection *** work presents an effective route to prepare high-performance self-power photodetector and provides a promising blueprint to realize different functional photoelectronic devices based on core/shell nanostructure.

关键词： GaN/ZnTe core/shell nanopillar array self-power ultraviolet/visible photodetector plasmonic effect

1.6-μm single-frequency erbium-doped fiber laser based on two cascaded subrings

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Chinese Optics Letters 2024年第4期22卷 77-82页

作者：翟雅琦文瀚陈浩伟陆宝乐白晋涛 State Key laboratory of Energy Photon-Technology in Western China International Collaborative Center on Photoelectric Technology and Nano Functional MaterialsInstitute of Photonics&Photon-TechnologyNorthwest UniversityXi’an 710127China Shaanxi Engineering Technology Research Center for Solid State Lasers and Application Shaanxi Provincial Key Laboratory of Photo-electronic TechnologyNorthwest UniversityXi’an 710127China

We demonstrate a stable narrow linewidth single-frequency erbium-doped fiber laser(EDFL)operating at 1.6μm.A Fabry–Perot fiber Bragg grating and two cascaded subrings are incorporated in the main ring cavity to achieve singlefrequency *** experimentally measured optical signal-to-noise ratio is greater than 73 ***,the linewidth of the EDFL is measured to be about 480 Hz by the self-built short-delayed self-heterodyne interferometry *** laser shows superior stability,with no mode-hopping during the 60-min observation *** proposed EDFL provides a new experimental idea for realizing a single-frequency fiber laser in the L-band.

关键词： erbium-doped fiber laser two cascaded subrings single frequency

Active metasurface via magnetic control for tri-channel polarization multiplexing holography

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Chinese Optics Letters 2024年第4期22卷 112-118页

作者：毕钰黄玲玲李拓王长红邹晓峰周朗康果果 Shandong Inspur Artificial Intelligence Research institute Company Limited Jinan 250013China MIIT Key laboratory of photonics Information Technology School of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China

Active metasurfaces have recently attracted more attention since they can make the light manipulation be versatile and real-time. Metasurfaces-based holography possesses the advantages of high spatial resolution and enormous information capacity for applications in optical displays and encryption. In this work, a tunable polarization multiplexing holographic metasurface controlled by an external magnetic field is proposed. The elaborately designed nanoantennas are arranged on the magneto-optical intermediate layer, which is placed on the metallic reflecting layer. Since the non-diagonal elements of the dielectric tensor of the magneto-optical material become non-zero values once the external magnetic field is applied,the differential absorption for the left and right circularly polarized light can be generated. Meanwhile, the amplitude and phase can be flexibly modulated by changing the sizes of the nanoantennas. Based on this, the dynamic multichannel holographic display of metasurface in the linear and circular polarization channels is realized via magnetic control, and it can provide enhanced security for optical information storage. This work paves the way for the realization of magnetically controllable phase modulation, which is promising in dynamic wavefront control and optical information encryption.

关键词： active metasurface magneto-optical effect polarization multiplexing holography dynamic holographic display

Low phase noise K-band signal generation using polarization diverse single-soliton integrated microcombs

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photonics Research 2024年第6期12卷 1175-1185页

作者： ALWALEED ALDHAFEERI HSIAO-HSUAN CHIN TRISTAN MELTON DONG IL LEE ALLEN CHU WENTING WANG MINGBIN YU PATRICK GUO-QIANG LO DIM-LEE KWONG CHEE WEI WONG Fang Lu Mesoscopic Optics and Quantum Electronics laboratory University of CaliforniaLos AngelesCalifornia 90095USA institute of Microelectronics A*STARSingapore 117865Singapore State Key laboratory of functional materials for Informatics Shanghai Institute of Microsystem and Information Technologyand Shanghai Industrial Technology Research InstituteShanghai 200050China

Frequency microcombs with microwave and millimeter-wave repetition rates provide a compact solution for coherent communication and information *** implementation of these microcombs using a CMOS-compatible platform further paves the way for large-scale photonic integration and ***,we demonstrate free-running soliton microcombs with K-band repetition rates with very low phase noise over a 4 GHz pump detuning range reaching−117(−123)dBc/Hz at 10 kHz offset for a 19.7(10)GHz carrier without active pump stabilization,exceeding commercial electronic microwave oscillators at frequency offsets above 40 *** minimum laser noise to soliton microwave signal transduction factor observed is−*** noise performance is achieved using a hybridized dual-mode for soliton generation to achieve passive thermal stabilization and minimal soliton spectrum shift from prior Raman scattering and dispersive wave *** further examine the locking of the repetition rate to an external ultrastable photonic oscillator to illustrate the feasibility of phase noise suppression below the thermorefractive noise limits of microresonator frequency combs.

关键词： pump polarization millimeter

Dynamic tunable LWIR achromatic metalens comprising all-As_(2)Se_(3) microstructures

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Chinese Optics Letters 2024年第6期22卷 191-195页

作者： Zhihao He Bingxia Wang Zhiang Qian Kongsi Zhou Xiang Shen Yungui Ma laboratory of Infrared materials and Devices The Research Institute of Advanced TechnologiesKey Laboratory of Photoelectric Detection Materials and Devices of Zhejiang ProvinceNingbo UniversityNingbo 315211China State Key laboratory of Modern Optical Instrumentation Centre for Optical and Electromagnetic ResearchCollege of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang UniversityHangzhou 310058China

In the field of long-wave infrared(LWIR) thermal imaging, vital for applications such as military surveillance and medical diagnostics, metalenses show immense potential for compact, lightweight, and low-power optical systems. However, to date, the development of LWIR broadband achromatic metalenses with dynamic tunable focus, which are suitable for both coaxial and off-axis applications, remains a large unexplored area. Herein, we have developed an extensive database of broadband achromatic all-As2Se3microstructure units for the LWIR range. Utilizing this database with the particle swarm optimization (PSO) algorithm, we have designed and demonstrated LWIR broadband achromatic metalenses capable of coaxial and off-axis focusing with three dynamic tunable states. This research may have potential applications for the design of compact, high-performance optical devices, including those with extreme depth-of-field and wide-angle imaging capabilities.

关键词： achromatic metalens long-wave infrared dynamic tunable focus

Free-moving-state microscopic imaging of cerebral oxygenation and hemodynamics with a photoacoustic fiberscope

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Light(Science & Applications) 2024年第1期13卷 33-46页

作者： Xiaoxuan Zhong Yizhi Liang Xiaoyu Wang Haoying Lan Xue Bai Long Jin Bai-Ou Guan Guangdong Provincial Key laboratory of Optical Fiber Sensing and Communications Institute of Photonics TechnologyJinan UniversityGuangzhou510632China

We report the development of a head-mounted photoacoustic fiberscope for cerebral imaging in a freely behaving *** 4.5-gram imaging probe has a 9-µm lateral resolution and 0.2-Hz frame rate over a 1.2-mm wide *** probe can continuously monitor cerebral oxygenation and hemodynamic responses at single-vessel resolution,showing significantly different cerebrovascular responses to external stimuli under anesthesia and in the freely moving *** example,when subjected to high-concentration CO_(2) respiration,enhanced oxygenation to compensate for hypercapnia can be visualized due to cerebral regulation in the freely moving *** studies exhibit significantly weakened compensation capabilities in obese *** new imaging modality can be used for investigating both normal and pathological cerebrovascular functions and shows great promise for studying cerebral activity,disorders and their treatments.

关键词： cerebral anesthesia moving