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Tunable metamaterial with quantitatively switchable anapole modes via quasi-BIC using two methods

Applied Physics Letters 2025年第20期126卷

作者： Sun, Yongzheng Chen, Yuxuan Qin, Xuefeng Huang, Yang Xiong, Han Xu, Nianxi Wang, Ben-Xin School of Science Jiangnan University Wuxi214122 China School of Electrical Engineering Chongqing University Chongqing400044 China Key Laboratory of Optical System Advanced Manufacturing Technology Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun130033 China Key Lab of Modern Optical Technologies of Education Ministry of China Soochow University Suzhou215006 China

Traditional anapole metamaterials exhibit limited tunability and only support single mode. Herein, we employ two methods to achieve the switch from anapole to dual-anapole in a simple metal-perforated structure. As the asymmetry parameter α increases, the quasi-bound states in the continuum (q-BIC) exhibit characteristics of an anapole mode, and switching between anapole and dual-anapole can be accomplished by altering the polarization mode. Alternatively, by incorporating graphene sheet, this functionality can also be realized at very low Fermi energy levels, and even enable anapole mode switching. Furthermore, the effect of the asymmetry parameter α on the sensing and slow-light properties of metamaterials is examined separately. The metamaterials demonstrate group delays of up to 100 ps and a sensitivity of 189 GHz/RIU. Our proposed tunable anapole metamaterials hold significant potential for applications in biosensing, filtering, and optical switching. © 2025 Author(s).

关键词： Metamaterials

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Time series clustering adaptive enhanced method for time-dependent reliability analysis and design optimization

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Computer Methods in Applied Mechanics and Engineering 2025年 443卷

作者： Zhang, Dequan Zhao, Ying Yang, Meide Jiang, Chao Han, Xu Li, Qing State Key Laboratory of Intelligent Power Distribution Equipment and System School of Mechanical Engineering Hebei University of Technology Tianjin 300401 China State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle College of Mechanical and Vehicle Engineering Hunan University Changsha410082 China School of Aerospace Mechanical and Mechatronic Engineering The University of Sydney New South Wales Sydney2006 Australia

Adaptive Kriging model has gained growing attention for its effectiveness in reducing the computational costs in time-dependent reliability analysis (TRA). However, the existing methods struggle to identify critical sample regions, leverage parallel computational resources, and assess the value for sample trajectories, thus restricting improvement in accuracy and efficiency. To address the challenges, this study proposes a time series clustering adaptive enhanced method (TSCM). TSCM first employs the time series clustering technique to partition the sample region efficiently. A novel time-dependent Kriging occurrence learning function is then introduced to account for both the uncertainty of sample trajectories and its influence on the approximated limit state boundary. Subsequently, an adaptive sampling strategy is developed to select training samples in parallel, guided by an uncertainty-based assessment of sample regions. After that, a time-dependent error-based stopping criterion is introduced to determine the training stage and terminate the update process. Finally, TSCM is extended to time-dependent reliability-based design optimization problems. Several numerical examples and an engineering case study demonstrate the superior computational efficiency and accuracy of the proposed method. © 2025

关键词： Time-to-failure

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Stitching swing arm profilometer test for large aperture aspherics

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Chinese Optics Letters 2019年第11期17卷 75-79页

作者： Ling Xiong Erhui Qi Xiao Luo Feng Zhang Donglin Xue Xuejun Zhang Key Laboratory of Optical System Advanced Manufacturing Technology Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China

We implemented a stitching swing arm profilometer(SSAP) test for the inner and outer regions of a large aspheric surface with a short arm. The SSAP was more capable of improving sampling density of surface and was less sensitive to system error, like vibration noise and air-table noise. Firstly, a calculation model was built to evaluate the sampling density of the SSAP test. Then, sensitivity to system noise was tested when different lengths of arm were used. At the end, an experiment on a 3 m diameter aspheric mirror was implemented, where test efficiency was promoted, and high sampling density was achieved.

关键词： system mirror swing

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design of High Uniformity and High Energy Efficiency Illumination Lens Based on Hypothetical Point Source Ensemble

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Guangxue Xuebao/Acta Optica Sinica 2025年第7期45卷

作者： Li, Ziheng Huo, Furong Xue, Changxi Yang, Chao Dong, Bo School of Optoelectronic Engineering Changchun University of Science and Technology Jilin Changchun130022 China Key Laboratory of Advanced Optical System Design and Manufacturing Technology of Universities of Jilin Province Changchun University of Science and Technology Jilin Changchun130022 China

Objective With the rapid advancement of modern science and technology, illumination systems have become an indispensable part of daily life. In fields such as road, medical, and industrial applications, a well-designed illumination system can significantly enhance safety. Therefore, designing an illumination system with a distributed light pattern that meets human needs has become a key focus in the lighting industry. Light emitting diodes (LEDs), with their advantages of environmental friendliness, energy efficiency, and high performance, have gradually replaced traditional light sources and are now the dominant light solution in the market. However, LEDs often require secondary optical design to achieve more uniform and efficient illumination, meeting the specific lighting needs of different environments and improving overall lighting quality and experience. In this paper, we propose a new method for designing a uniform lighting lens in the context of illumination engineering. Methods In light of the luminous characteristics of LED light sources, a novel hypothesis is proposed for designing extended LED light sources, treating the extended light source as a collection of infinite point sources. The divergence halfangle limit for each small point source is strictly defined, and a uniform internal freeform surface is designed to serve as a secondary light source. The external freeform surface then maps the uniform secondary source to the target surface, a method called the hypothetical point source ensemble (HPE). Based on the inner freeform surface, the outer surface is designed by analyzing the point-to-point energy mapping from the light source to the illuminated plane using the source-target mapping method. We derive the corresponding theoretical model and a new formula for calculating the emitted light angle. The point convergence of the outer freeform surface is calculated using Snell’s law in vector form and the tangent iteration method. The discrete point cl

关键词： optical design

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Test piece design, mechanical properties and fracture strain in two-step tensile testing of lightweight materials at high strain rates

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International Journal of Impact Engineering 2025年

作者： Da Cai Hao Jiang Peng Wang Qing Wang Weifeng Gan Junjia Cui Guangyao Li State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle Hunan University Changsha 410082 China Battery System Development Department Contemporary Amperex Technology Co. Ltd Ningde 352100 China Shenzhen Huashun Intelligent Equipment Co. Ltd Shenzhen 518119 China Shenzhen Automotive Research Institute Beijing Institute of Technology Shenzhen 518119 China

Continuous forming at high strain rates is an important research direction for future precision forming of light alloys. In this study, dynamic behavior of AA5052 aluminum alloy in two-step tensile testing at high strain rates were investigated. Special two-step tensile test piece at high strain rate was designed. The test piece of the special design contained a weak structural notch area and a dog-bone shaped area. The test piece was pre-stretched to a pre-determined strain so that the weak region broke. Then a secondary stretching was performed. The response surface equations of pre-strain and pre-strain rate were established separately to evaluate the functional relationship between the notch interval, tensile velocity and strain rate, and equivalent plastic strain. The effects of the parameters on the fracture strain were compared. The results showed that the test pieces could meet the requirements of the two-step tensile test at high strain rates. The pre-strain and pre-strain rate were affected by the size of the notch interval and the tensile velocity. The increase of tensile strength was related to pre-strain and secondary strain rate. The linear cumulative damage criterion can be used to interpret the two-step stretching at high strain rates. When the strain rate in single-step stretching is the same as the strain rate in each step of two-step stretching, the fracture strain in single-step stretching can be substituted for the fracture strain in two-step stretching. Research can help solve the problems of poor formability and early failure of lightweight alloys.

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design of Cooled Dual-Group Linked Continuous Zoom Hybrid Refractive-Diffractive system Based on Double-Layer Diffractive Element

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Guangxue Xuebao/Acta Optica Sinica 2025年第9期45卷

作者： Ma, Chengshuang Li, Ying Xue, Changxi Key Laboratory of Advanced Optical System Design and Manufacturing Technology of Jilin Province Changchun University of Science and Technology Jilin Changchun130022 China Department of Instrument Science and Technology Changchun University of Science and Technology Jilin Changchun130022 China School of Optoelectronic Engineering Changchun University of Science and Technology Jilin Changchun130022 China

Objective In recent years, with increasing demands for imaging optical systems and continuous advancements in manufacturing technologies, dual-band infrared zoom optical systems have been widely applied in various fields such as military reconnaissance, precision guidance, airborne electro-optical pods, aerospace, security, and night vision surveillance. Continuous zoom infrared lenses enable target searching over a wide field of view and rapid switching to a narrow field of view for precise tracking and observation. This capability is particularly advantageous for tracking high-speed moving targets, addressing the issue of losing targets during field-of-view switching in stepped zoom lenses. However, dual-band infrared zoom systems face challenges such as complex structures, difficult aberration correction, suboptimal image quality, and limited material selection. Therefore, developing a high-performance dual-band infrared zoom optical system is crucial for advancing imaging optical systems. Methods First, in the dual-band infrared range of 3.7‒4.8 μm and 8‒10 μm, a double-layer diffractive optical element (DOE) is designed using a method that maximizes polychromatic integrated diffraction efficiency (PIDE) considering angular-wavelength characteristics. The wavelengths corresponding to the maximum PIDE values are selected as the design wavelengths, and the corresponding microstructure height parameters are calculated. The designed double-layer DOE achieves a comprehensive PIDE of 98.29%, demonstrating high diffraction efficiency across the dual-band infrared range. Second, a dual-group linked zoom model is derived. Using this model, the component distances at different focal lengths are calculated. These parameters are then input into optical design software to develop a dual-band infrared zoom optical system with a continuous zoom range of 30‒300 mm. However, the initial system exhibits suboptimal image quality. Finally, the high-efficiency double-layer DOE is in

关键词： Thermography (imaging)

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I3−/I−Redox Reaction-mediated Organic Zinc-Air Batteries with Accelerated Kinetics and Long Shelf Lives

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Angewandte Chemie 2023年第26期135卷

作者： Mangwei Cui Ninggui Ma Hao Lei Youfa Liu Wei Ling Sheng Chen Jiaqi Wang Prof. Hongfei Li Zhaohui Li Prof. Jun Fan Prof. Yan Huang State Key Laboratory of Advanced Welding and Joining Sauvage Laboratory for Smart Materials Shenzhen Key Laboratory of Flexible Printed Electronics Technology School of Materials Science and Engineering Harbin Institute of Technology (Shenzhen) Shenzhen 518055 China Department of Materials Science and Engineering City University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong 999077 China Key Laboratory of Radiation Physics and Technology of Ministry of Education Institute of Nuclear Science and Technology Sichuan University Chengdu 610064 China School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen 518055 China Songshan Lake Materials Laboratory Dongguan 523808 China Shenzhen China Star Optoelectronic Semiconductor Display Technology Co. Ltd. Shenzhen 518055 China

The storage time of Zn-air batteries (ZABs) for practical implementation have been neglected long-lastingly. ZABs based on organic solvents promise long shelf lives but suffer from sluggish kinetics. Here, we report a longly storable ZAB with accelerated kinetics mediated by I 3 − /I − redox. In the charge process, the electrooxidation of Zn 5 (OH) 8 Cl 2 ⋅H 2 O is accelerated by I 3 − chemical oxidation. In the discharge process, I − adsorbed on the electrocatalyst changes the energy level of oxygen reduction reaction (ORR). Benefitting from these advantages, the prepared ZAB shows remarkably improved round-trip efficiency (56.03 % vs. 30.97 % without the mediator), and long-term cycling time (>2600 h) in ambient air without replacing any components or applying any protective treatment to Zn anode and electrocatalyst. After resting for 30 days without any protection, it can still directly discharge continuously for 32.5 h and charge/discharge very stably for 2200 h (440 cycles), which is evidently superior to aqueous ZABs (only 0/0.25 h, and 50/25 h (10/5 cycles) by mild/alkaline electrolyte replenishment). This study provides a strategy to solve both storage and sluggish kinetics issues that have been plaguing ZABs for centuries, opening up a new avenue to the industrial application of ZABs.

关键词： Iodine-Containing Reaction Kinetics Redox Mediators Storage Time Zn-Air Batteries

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Microcavity electrodynamics of hybrid surface plasmon polariton modes in highquality multilayer trench gratings

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Light(Science & Applications) 2018年第1期7卷 844-853页

作者： Xiaoyi Liu Jinbo Gao Jinsong Gao Haigui Yang Xiaoyi Wang Tongtong Wang Zhenfeng Shen Zhen Liu Hai Liu Jian Zhang Zizheng Li Yanchao Wang Qiang Li Key Laboratory of Optical System Advanced Manufacturing Technology Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China University of the Chinese Academy of Sciences Beijing 100039China

In common plasmonic structures,absorption and radiation losses are often mutually restricted and can seriously influence the device *** current study presents a compound structure composed of multilayer grating stripes and multilayer shallow trenches.A small depth was adopted for the trench configuration to exclude the extra bend *** two sections supported Fabry–Perot resonance and cavity modes,respectively,with hybrid modes formed through *** addition,the total loss for the entire framework was clearly reduced due to the introduction of the trench geometry,indicating that both absorption and radiation losses were successfully taken into consideration in the compound ***,such a low loss realized by the hybridization of surface plasmon polariton modes has rarely been seen ***,the debatable relationship between the total and partial quality factors was described for the first time based on a hybrid mode analysis to establish a new approach to investigate the different resonance *** the detailed calculation process,the relative electric field intensity was first adopted to stipulate the effective areas for the various modes,which is more reasonable than using the common definition that is based on a unit *** multilayer trench grating exhibited a relatively low loss without weakening energy localization,which is significant in the design of plasmonic devices.

关键词： trench multilayer cavity

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Small-period Ultra-broadband Long-wavelength Infrared Metamaterial Absorber

Small-period Ultra-broadband Long-wavelength Infrared Metama...

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Progress in Electromagnetics Research Symposium - Fall (PIERS - FALL)

作者： Zheng Qin Dejia Meng Ying Xiong Yinhui Tang Yu Zhou Xiaoyan Shi Yuhao Zhang Enzhu Hou Zhongzhu Liang Key Laboratory of Optical System Advanced Manufacturing Technology Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun China

ISBN: (数字)9781728153049

ISBN: (纸本)9781728153056

In this paper, we describe the design of a small-period ultra-wideband long-wavelength infrared metamaterial absorber. The two-layer metal (titanium) resonators and the underlying metal reflective layer are vertically stacked, and the layers are filled with a dielectric (silicon), where the two cross-shaped resonators have slightly different sizes. The absorption spectrum of the structure reaches absorbance values above 90% in the wavelength interval of 8 μm and 13.15 μm in the case of normal incidence. Through a field distribution analysis, we found that the propagation surface plasmons and localized surface plasmons excited by titanium resonators caused two broad absorption peaks (8.5 μm and 12.2 μm), which were close to each other, to obtain the final broadband absorption. Furthermore, the thickness of the structure is less than 1/13 of the centre wavelength (11 μm), and the period is only 1/5 of the centre wavelength (11 μm), which makes the structure easy to integrate on small-pixel detectors. Therefore, such designs may be useful in infrared imaging, thermal detection, and thermal emitters.

关键词： Absorption Resonators Titanium Bandwidth Metamaterials Magnetic resonance imaging

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MATRIEX imaging:multiarea two-photon real-time in vivo explorer

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Light(Science & Applications) 2019年第1期8卷 156-166页

作者： Mengke Yang Zhenqiao Zhou Jianxiong Zhang Shanshan Jia Tong Li Jiangheng Guan Xiang Liao Bing Leng Jing Lyu Kuan Zhang Min Li Yan Gong Zhiming Zhu Junan Yan Yi Zhou Jian K Liu Zsuzsanna Varga Arthur Konnerth Yuguo Tang Jinsong Gao Xiaowei Chen Hongbo Jia Key Laboratory of Optical System Advanced Manufacturing Technology Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China Graduate School University of the Chinese Academy of SciencesBeijing 100039China Brain Research Instrument Innovation Center Suzhou Institute of Biomedical Engineering and TechnologyChinese Academy of SciencesSuzhou 215163China Brain Research Center and State Key Laboratory of Trauma Burnsand Combined InjuryThird Military Medical UniversityChongqing 400038China Center for Neurointelligence Chongqing UniversityChongqing 401331China Center for Hypertension and Metabolic Diseases Daping HospitalChongqing 400042China Advanced Institute of Brain and Intelligence Guangxi UniversityNanning 530005China Centre for Systems Neuroscience Department of NeurosciencePsychology and BehaviourUniversity of LeicesterLeicesterUK Institute of Neuroscience Technical University Munich80802 MunichGermany

Two-photon laser scanning microscopy has been extensively applied to study in vivo neuronal activity at cellular and subcellular resolutions in mammalian ***,the extent of such studies is typically confined to a single functional region of the ***,we demonstrate a novel technique,termed the multiarea two-photon real-time in vivo explorer(MATRIEX),that allows the user to target multiple functional brain regions distributed within a zone of up to 12mm in diameter,each with a field of view(FOV)of ~200μm in diameter,thus performing two-photon Ca2+imaging with single-cell resolution in all of the regions *** example,we demonstrate real-time functional imaging of single-neuron activities in the primary visual cortex,primary motor cortex and hippocampal CA1 region of mice in both anesthetized and awake states.A unique advantage of the MATRIEX technique is the configuration of multiple microscopic FOVs that are distributed in three-dimensional space over macroscopic distances(>1 mm)both laterally and axially but that are imaged by a single conventional laser scanning *** particular,the MATRIEX technique can be effectively implemented as an add-on optical module for an existing conventional single-beam-scanning two-photon microscope without requiring any modification to the microscope ***,the MATRIEX technique can be readily applied to substantially facilitate the exploration of multiarea neuronal activity in vivo for studies of brain-wide neural circuit function with single-cell resolution.

关键词： photon readily typically

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