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Design of a Broadband Tunable Terahertz Metamaterial Absorber Based on Complementary Structural Graphene.

Authors :
Huang, Mu Lin
Cheng, Yong Zhi
Cheng, Zheng Ze
Chen, Hao Ran
Mao, Xue Song
Gong, Rong Zhou
Source :
Materials (1996-1944). Apr2018, Vol. 11 Issue 4, p540. 1p. 3 Color Photographs, 1 Diagram, 2 Graphs.
Publication Year :
2018

Abstract

We present a simple design for a broadband tunable terahertz (THz) metamaterial absorber (MMA) consisting of a complementary cross-oval-shaped graphene (CCOSG) structure and dielectric substrate placed on a continuous metal film. Both numerical simulation and theoretical calculation results indicate that the absorbance is greater than 80% from 1.2 to 1.8 THz, and the corresponding relative bandwidth is up to 40%. Simulated electric field and power loss density distributions reveal that the broadband absorption mainly originates from the excitation of continuous surface plasmon resonance (SPR) on the CCOSG. In addition, the MMA is polarization-insensitive for both transverse-electric (TE) and transverse-magnetic (TM) modes due to the geometry rotational symmetry of the unit-cell structure. Furthermore, the broadband absorption properties of the designed MMA can be effectively tunable by varying the geometric parameters of the unit-cell and chemical potential of graphene. Our results may find promising applications in sensing, detecting, and optoelectronic-related devices. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
19961944
Volume :
11
Issue :
4
Database :
Academic Search Index
Journal :
Materials (1996-1944)
Publication Type :
Academic Journal
Accession number :
129340692
Full Text :
https://doi.org/10.3390/ma11040540