Narrow and Dual-Band Tunable Absorption of a Composite Structure with a Graphene Metasurface
Ren-Xia Ning1**, Zheng Jiao1, Jie Bao2
1School of Information Engineering, Huangshan University, Huangshan 245041 2School of Mechanical and Electrical Engineering, Huangshan University, Huangshan 245041
Abstract：A tunable absorber, composed of a graphene ribbon on two layers of TiO$_{2}$-Au between two slabs of dielectric material all on a metal substrate, is designed and numerically investigated. The absorption of the composite structure varies with the geometrical parameters of the structure and the physical parameters of graphene at mid-infrared frequencies. The numerical simulation shows that a near-perfect absorption with single and dual bands can be achieved in a certain frequency range. We also analyze the electric and surface current distributions to study the dual-band absorber. The results show that the absorber can be tuned by the chemical potential and electron–phonon relaxation time of graphene, and electromagnetically induced transparency phenomenon can be obtained. The results of this study may be beneficial in the fields of infrared communication, perfect absorbers, sensors and filters.
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2017, Vol. 34 
