Abstract-Controlling the transparency window in terahertz band using mode coupling metamaterials

Shen Qiao¹, Yaxin Zhang^1,a), Gaiqi Xu¹, Linlin Sun¹, Han Sun¹, Ling Li¹,Shixiong Liang², Yuncheng Zhao¹ and Ziqiang Yang¹
http://scitation.aip.org/content/aip/journal/jap/117/6/10.1063/1.4907870
1 Terahertz Science Cooperative Innovation Center, University of Electronic Science and Technology of China, Chengdu 610054, China
2 National Key Laboratory of Application Specific Integrated Circuit, Hebei Semiconductor Research Institute, Shijiazhuang 050051, China
a) Author to whom correspondence should be addressed. Electronic mail: Zhangyaxin@uestc.edu.cn
J. Appl. Phys. 117, 063103 (2015); http://dx.doi.org/10.1063/1.4907870

Mode-coupling metamaterials are typically composite structures with different resonance modes. Controlling couplings among these modes results in a sharp transparency window within the absorption spectrum of the metamaterials. Here, we present a composite structure of ring and split-ring resonators to constitute a new structure with entirely new mode. Experimental results show that the asymmetric combination of these resonators can result in a variation in transparency strength. The dimensions and relative positions of the split-ringresonator are discussed particularly with a series of experimental results. Simulation results show that the coupling intensity is the main reason for this behavior. Exploiting this aspect, a way to control the transparency window between composite structure metamaterials is proposed.