Title :
Design of a tunable absorber based on graphene in the terahertz band
Author :
Bingzheng Xu ; Changqing Gu ; Zhuo Li ; Liangliang Liu ; Zhenyi Niu
Author_Institution :
Key Lab. of Radar Imaging & Microwave Photonics, Nanjing Univ. of Aeronaut. & Astronaut. Nanjing, Nanjing, China
Abstract :
An effective method for for controlling the absorption frequency of terahertz (THz) absorber based on graphene is presented in this paper. The absorber consists of graphene-dielectric stack with a resistive sheet on top layer and a perfect electric conductor placed at the bottom layer. A circuit model for graphene absorber was introduced to analyze the mechanism of the absorber. By changing the surface conductivity of graphene, fine tuning of the absorption resonances is achieved. The result of the proposed circuit model can be individually validated with the full-wave simulations, which are in a good agreement. In addition, the double-layer graphene-dielectric stack absorber exhibits stable resonances with respect to the incident plane wave at all oblique angles.
Keywords :
absorption; equivalent circuits; frequency control; graphene; sheet materials; surface conductivity; terahertz materials; THz absorber; absorption frequency control; absorption resonance tuning; circuit model; double-layer graphene-dielectric stack absorber; equivalent circuit method; full-wave simulations; perfect electric conductor; resistive sheet; surface conductivity; terahertz band; tunable absorber design; Absorption; Dielectrics; Graphene; Impedance; Integrated circuit modeling; Resonant frequency; Surface waves; absorber; equivalent circuit method (ECM); graphene;
Conference_Titel :
Antennas and Propagation (APCAP), 2014 3rd Asia-Pacific Conference on
Conference_Location :
Harbin
Print_ISBN :
978-1-4799-4355-5
DOI :
10.1109/APCAP.2014.6992667
