Broadband tunable mid-infrared metamaterial absorber based on graphene and VO2 thin film
Broadband tunable mid-infrared metamaterial absorber based on graphene and VO2 thin film
复制标题
基于石墨烯和VO2薄膜的宽带可调谐中红外超材料吸收器
DOI：
10.1117/12.2326937
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发表时间：
2018-07
期刊：
影响因子：
--
通讯作者：
Changhong Chen
中科院分区：
文献类型：
--
作者：
Junhe Yang;Shuai Xun;Zhenyao Chen;Changhong Chen
We design a broadband absorber formed by placing the cross-shaped metallic resonators, whose vertical and horizontal arms have difference length, with 90° rotated within a super-unit-cell arranged in mirror symmetry. Simulation results indicate that absorption efficiency greater than 95% can be achieved in a broadband frequency region under normal incidence. We employ a design scheme with the integration of graphene and VO2thin film, which allows independent electric tuning and thermal tuning. Our results reveal that the resonance will be blue-shifted with the increase of Fermi level and red-shifted with the increase of temperature. it thus broadens the tuning range of metamaterial absorbers by combining the electric tuning of graphene with the thermal tuning of VO2thin film. this structure may have great application potential in frequency selective detectors and testing technology
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