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Ultrathin planar broadband absorber through effective medium design

Nano Research 2016年第8期9卷 2354-2363页

作者： Dong Liu Haitong Yu Zhen Yang Yuanyuan Duan School of Energy and Power Engineering Nanjing University of Science & Technology Nanjing 210094 China Key Laboratory of Thermal Science and Power Engineering of Ministry of Education Key Laboratory for CO2 Utilization and Reduction Technology Tsinghua University Beijing 100084 China

Ultrathin planar absorbers hold promise in solar energy systems because they can reduce the material, fabrication, and system cost. Here, we present a general strategy of effective medium design to realize ultrathin planar broadband absorbers. The absorber consists of two ultrathin absorbing dielectrics to design an effective absorbing medium, a transparent layer, and metallic substrate. Compared with previous studies, this strategy provides another dimension of freedom to enhance optical absorption; therefore, destructive interference can be realized over a broad spectrum. To demonstrate the power and simplicity of this strategy, we both experimentally and theoretically characterized an absorber with 5-nm-thick Ge, 10-nm-thick Ti, and 50-nm-thick SiO2 films coated on an Ag substrate fabricated using simple deposition methods. Absorptivity higher than 80% was achieved in 15-nm-thick （1/50 of the center wavelength） Ge and Ti films from 400 nm to near 1 btm. As an application example, we experimentally demonstrated that the absorber exhibited a normal solar absorptivity of 0.8 with a normal emittance of 0.1 at 500 ~C, thus demonstrating its potential in solar thermal systems. The effective medium design strategy is general and allows material versatility, suggesting possible applications in real-time optical manipulation using dynamic materials.

关键词： ultrathin planar film broadband absorber effective medium design solar energy

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broadband and High-Temperature-Resistant Microwave absorber Using Additively Manufactured Ceramic Substrate

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Chinese Journal of Mechanical Engineering(Additive Manufacturing Frontiers) 2023年第4期2卷 59-64页

作者： Baihong Chi Kuan Lu Pengfei Wang Mengzhu Li Yuanyuan Li Xinyu Geng Guangsheng Deng Advanced Materials and Energy Research Center China Academy of Aerospace Science and InnovationBeijing100063China Academy of Opto-Electronic Technology Hefei University of TechnologyHefei230009China

This paper presents an approach to achieve broadband absorption and temperature resistance using ceramic sub-strates.A specially formulated slurry suitable for additive manufacturing technology was developed to fabricate ceramic substrates with lattice *** lattice structure not only reduces the weight of the absorber but also facilitates the broadening of the absorption *** experimental results demonstrate that the pro-posed structure exhibits absorption rates exceeding 88%within the frequency range of 19.9-30.41 GHz,with a relative absorption bandwidth of 41.8%under normal ***,the absorber’s performance was assessed under high temperatures of up to 200℃,revealing absorption spectra that closely match the initially measured ***-manufactured ceramic lattice structures present a promising avenue for designing multifunctional broadband microwave absorbers capable of withstanding elevated temperatures.

关键词： broadband absorber Ceramic Additive manufacturing Temperature resistance

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Bidirectional visible light absorber based on nanodisk arrays

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Chinese Physics B 2023年第3期32卷 68-71页

作者：王琦朱非凡李瑞张世杰张大伟 Engineering Research Centre of Optical Instrument and System the Ministry of EducationShanghai Key Laboratory of Modern Optical SystemUniversity of Shanghai for Science and TechnologyShanghai 200093China

A perfect bidirectional broadband visible light absorber composed of titanium nitride and tungsten nanodisk arrays is *** average absorption of the absorber exceeds 89%at 400 nm–800 nm when light is normally incident on the *** from the opposite direction(back-side)results in absorption of more than 75%.Through the theoretical analysis of the electric and magnetic fields,the physical mechanism of the broadband perfect absorption is attributed to the synergy of localized surface plasmons,propagating surface plasmons,and plasmonic resonant cavity ***,the absorber also exhibits excellent polarization-independence performance and a high angular tolerance of~30°for both front-and back-side *** designed bidirectional broadband visible light absorber here has wide application prospects in the fields of solar cells and ink-free printing.

关键词： bidirectional absorption broadband absorber polarization-independent nanodisk arrays

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