Ultrawideband terahertz absorber with a graphene-loaded dielectric hemi-ellipsoid

• DOI: 10.1364/oe.401069
• Publication Date: 2020-08-24T14:00:09Z
• Authors: Renbin Zhong; Long Yang; Zekun Liang; Zhenhua Wu; Yiqin Wang; AnChen Ma; Zheng Fang; Shenggang Liu
• Keywords: Ellipsoid

We herein present a high-performance ultrawideband terahertz absorber with silicon hemi-ellipsoid (SHE) on monolayer graphene that is separated by dielectric spacer from bottom metal reflector. The constitution of the absorber, which includes dielectric-mode structures and unstructured graphene, can minimize undesired optical losses in metals avoid processing. achieved an ultrawide absorption bandwidth 2 THz to more than 10 average 95.72%, relative 133%. excellent properties are owing presence shape morphing SHE, multiple discrete plasmon resonances (GPRs) continuous multimode Fabry–Perot (FPRs) be excited. By coupling GPRs FPRs, spectrum extended smoothed realize absorber. incident angular insensitivity within 50° discussed. results will shed light better performance trapping, imaging, communication detection.