Multiband Metamaterial Absorber at Terahertz Frequencies
XU Zong-Cheng1,2**, GAO Run-Mei1,3, DING Chun-Feng1, ZHANG Ya-Ting1, YAO Jian-Quan1
1Institute of Laser and Opto-electronics and Key Laboratory of Opto-electronics Information Science and Technology, Tianjin University, Tianjin 300072 2Department of Physics, Tianjin University Renai College, Tianjin 301636 3College of science, Guilin University of Technology, Guilin 541004
Abstract：We propose a multi-band metamaterial absorber operating at terahertz frequencies. The design, characterization, and theoretical calculation of the high performance metamaterial absorber are reported. The multi-band metamaterial absorber consists of two metallic layers separated by a dielectric spacer. Theoretical and simulated results show that the metamaterial absorber has four distinct absorption points at frequencies 0.57 THz, 1.03 THz, 1.44 THz and 1.89 THz, with the absorption rates of 99.9%, 90.3%, 83.0%, 96.1%, respectively. Two single band metamaterial absorbers and a dual band metamaterial absorber on the top layer are designed. Some multi-band absorbers can be designed by virtue of combining some single band absorbers. The multiple-reflection theory is used to explain the absorption mechanism of our investigated structures.
2014, Vol. 31 
