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optical transparent metamaterial structure for microwave-infrared-compatible camouflage based on indium tin oxide

中国科学:技术科学英文版 2023年第10期66卷 2850-2861页

作者： LUO Hui XIONG Yao CHENG YongZhi CHEN Fu LI XiangCheng School of Information Science and Engineering Wuhan University of Science and TechnologyWuhan 430081China State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081China

A visible transparent metamaterial absorber was designed and fabricated with ultrabroadband microwave absorption and low infrared emissivity to meet the increasing demand for multispectral compatible camouflage. The absorber was fabricated with a low-infrared emissive layer at the top, a microwave-absorbing layer in the middle, and a reflective layer at the bottom, which were separated by polymethyl methacrylate plates. The absorber showed an average visible transmittance of 55%, infrared emissivity of ~0.37, and effective microwave absorption bandwidth of 32.1 GHz with a total thickness of 3.0 mm. Furthermore,microwave absorption exhibited wide-angle stability and polarization insensitivity characteristics. The mechanism of microwave attenuation was further explored through effective electromagnetic parameters as well as surface current, electric field, magnetic field, and energy loss density distributions. The experimental results were consistent with those of the simulations and calculations, indicating the potential of the designed metamaterial absorber for future applications in multispectral compatible camouflage.

关键词： optical transparent microwave absorption metamaterial low infrared emissivity indium tin oxide

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transparent Thermally Tunable Microwave Absorber Prototype Based on Patterned VO2 Film

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Engineering 2023年第10期29卷 198-206页

作者： Zhengang Lu Yilei Zhang Heyan Wang Chao Xia Yunfei Liu Shuliang Dou Yao Li Jiubin Tan Ultra-Precision optical and Electronic Instrument Engineering Center Harbin Institute of TechnologyHarbin 150001China Key Laboratory of Ultra-Precision Intelligent Instrumentation(Harbin Institute of Technology) Ministry of Industry and Information TechnologyHarbin 150001China Center for Composite Material and Structure Harbin Institute of TechnologyHarbin 150001China

transparent microwave absorbers that exhibit high optical transmittance and microwave absorption capability are ideal,although having a fixed absorption performance limits their applicability.Here,a simple,transparent,and thermally tunable microwave absorber is proposed,based on a patterned vanadium dioxide(VO_(2))film.Numerical calculations and experiments demonstrate that the proposed VO_(2)absorber has a high optical transmittance of 84.9%at 620 nm;its reflection loss at 15.06 GHz can be thermally tuned from–4.257 to–60.179 dB,and near-unity absorption is achieved at 523.750 K.Adjusting only the patterned VO_(2)film duty cycle can change the temperature of near-unity absorption.Our VO_(2)absorber has a simple composition,a high optical transmittance,a thermally tunable microwave absorption performance,a large modulation depth,and an adjustable temperature tuning range,making it promising for application in tunable sensors,thermal emitters,modulators,thermal imaging,bolometers,and photovoltaic devices.

关键词： Tunable microwave absorber VO_(2)film optical transparent Near unity absorption Large modulation depth

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