Multi-mode plasmonic resonance broadband LWIR metamaterial absorber based on lossy metal ring
Zheng Qin, Xiaoyan Shi, Fuming Yang, Enzhu Hou, Dejia Meng, Chunfang Sun, Rui Dai, Shoutao Zhang, Hua Liu, Haiyang Xu, Zhongzhu Liang
Abstract
Broadband perfect infrared wave absorption of unpolarized light over a wide range of angles in an ultrathin film is critical for applications such as thermal emitters and imaging. Although many efforts have been made in infrared broadband absorption, it is still challenging to cover the perfect absorption of broadband in the long-wave infrared band. We propose a long-wave infrared broadband, polarization, and incident angle insensitivity metamaterial absorber based on the supercell with four rings of two sizes. Broadband absorption covering the long-wave infrared band is realized by combining four PSPRs and LSPRs absorption peaks excited by the supercell structure. The absorptivity of our absorber exceeds 90% in the wavelength range of 7.76∼14µm, and the average absorptivity reaches 93.8%. The absorber maintains more than 80% absorptivity as the incident angle of unpolarized light reaches 60°, which may have promising applications for thermal emitters, infrared imaging, thermal detection.