Hybridization-induced broadband terahertz wave absorption with graphene metasurfaces

• DOI: 10.1364/oe.26.011728
• Publication Date: 2018-04-23T15:38:33Z
• Authors: Nanli Mou; Shulin Sun; Hongxing Dong; Shaohua Dong; Qiong He; Lei Zhou; Long Zhang
• Keywords: 0103 physical sciences; 01 natural sciences; 7. Clean energy

Electromagnetic (EM) wave absorption plays a vital role in photonics. While metasurfaces are proposed to absorb EM waves efficiently, most of them exhibit limited bandwidth and fixed functionalities. Here, we propose broadband tunable terahertz (THz) absorber based on graphene-based metasurface, which is constructed by single layer closely patterned graphene concentric double rings metallic mirror separated an ultrathin SiO2 layer. Plasmonic hybridization between two significantly enlarges the bandwidth, can be further tuned gating graphene. Moreover, specific design also makes our device insensitive incident angle polarization state impinging waves. Our results may inspire certain wave-modulation-related applications, such as THz imaging, smart absorber, sensor, etc.