Design of a Far-Infrared Broadband Metamaterial Absorber with High Absorption and Ultra-Broadband
Source abstract
Abstract
We designed a metamaterial far-infrared absorber based on an MDM (metal–dielectric–metal) structure. We made a hollow crossed Ti microstructure at the top of the absorber. It is known that the coupling effect of equipartitional exciton resonance and intrinsic absorption at the surface of the depleting material has a strong influence on the absorber. Based on this, we investigated the absorption characteristics of the absorber using the Finite Difference in Time Domain (FDTD) theory. The results show that the absorber absorbed more than 90% of the light within a bandwidth of 12.01 μm. The absorber has an average absorption of 94.08% in the longwave infrared (LWIR) to ultra-longwave infrared (UWIR) bands (10.90–22.91 μm). The polarization insensitivity of the designed absorber is demonstrated by analyzing the absorption spectra of the absorber at different polarization angles. By adjusting the relevant geometric parameters, the absorption spectrum can be independently adjusted. Furthermore, the absorber exhibits good incidence angle insensitivity in both transverse electric (TE) and transverse magnetic (TM) modes. The absorbers are simple and easy to configure for applications such as optical cloaking, infrared heat emitters, and photodetectors. These advantages will greatly benefit the application of absorbers in practice.
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Research context
OpenAlex topics: Advanced Antenna and Metasurface Technologies · Antenna Design and Analysis · Metamaterials and Metasurfaces Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Joint Laboratory for Extreme Conditions Matter Properties, Key Laboratory of Manufacturing Process Testing Technology of Ministry of Education, State Key Laboratory of Environment-Friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621010, China
College of Physics and Electronics, Central South University, Changsha 410083, China
School of Physics and Optoelectronic Engineering, Yangtze University, Jingzhou 434023, China
School of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, China
Department of Physics, Jinzhong University, Jinzhong 030619, China
College of Science, Zhejiang University of Technology, Hangzhou 310023, China
Guangxi Key Laboratory of Precision Navigation Technology and Application, Guilin University of Electronic Technology, Guilin 541004, China
School of Physics and Electronic-Information Engineering, Hubei Engineering University, Xiaogan 432000, China
Funding
National Natural Science Foundation of China · Natural Science Foundation of Fujian Province · Guangxi Science and Technology Base and Talent Special Project · Sichuan Science and Technology Program · Research Project of Fashu Foundation · Open Fund of the Key Laboratory for Metallurgical Equipment and Control Technology of Ministry of Education in Wuhan University of Science and Technology, China · Guangxi Key Laboratory of Precision Navigation Technology and Application, Guilin University of Electronic Technology · Scientific Research Project of Huzhou College
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