Open AccessA novel structure for tunable terahertz absorber based on graphene
Author(s) -
Bingzheng Xu,
Changzhi Gu,
Zhuo Li,
Zhenyi Niu
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.023803
Subject(s) - graphene , terahertz radiation , materials science , optoelectronics , optics , dielectric , absorption (acoustics) , narrowband , broadband , electromagnetic radiation , metamaterial absorber , metamaterial , layer (electronics) , nanotechnology , tunable metamaterials , physics , composite material
Graphene can be used as a platform for tunable absorbers for its tunability of conductivity. In this paper, we proposed an "uneven dielectric slab structure" for the terahertz (THz) tunable absorber based on graphene. The absorber consists of graphene-dielectric stacks and an electric conductor layer, which is easy to fabricate in the manufacturing technique. Fine tuning of the absorption resonances can be conveniently achieved by adjusting the bias voltage. Both narrowband and broadband tunable absorbers made of this structure are demonstrated without using a patterned graphene. In addition, this type of graphene-based absorber exhibits stable resonances with a wide range angles of obliquely incident electromagnetic waves.