AUTHOR=Sun Jian-Zhong , Li Jiu-Sheng 

TITLE=Broadband Adjustable Terahertz Absorption in Series Asymmetric Oval-Shaped Graphene Pattern

JOURNAL=Frontiers in Physics

VOLUME=Volume 8 - 2020

YEAR=2020

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2020.00245

DOI=10.3389/fphy.2020.00245

ISSN=2296-424X

ABSTRACT=We propose a broadband adjustable graphene absorber in terahertz regime. A prototype is designed to verify the terahertz absorption characteristics by a layer of a periodic array of series asymmetric oval-shaped graphene patterns on polyimide and bottom layer of metal plate. The absorber with 92% absorption and the bandwidth ranging from 3.39 THz to 5.96 THz can be achieved. By changing the Fermi level of graphene, the bandwidth and absorption can be flexibly adjusted. The absorption remains above 92% in the range of 0~40º incident angle. Using these characteristics, the simple absorber has broad application prospects in the fields of filter and switch in terahertz region.