1.School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China;2.Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Capital Normal University, Beijing 100048, China
the Beijing Advanced Innovation Center for Imaging Theory and Technology 19530012003Supported by the Beijing Advanced Innovation Center for Imaging Theory and Technology (19530012003)
A terahertz photo-excited tunable metamaterial sensor is investigated. It is composed of a hybrid metal-semiconductor structure (which is a split ring resonator (SRR)) and a flexible polyimide substrate. Silicon is filled in the gaps of the structure. Simulation results reveal that the conductivity of the semiconductor component can be tuned by changing the external pump light’s power, resulting in resonant peak shift of the composited metamaterial structure. The electric field and surface current density distributions of this structure under different resonant frequencies are also analyzed. The physical mechanism of this device has been further discussed. Moreover, the resonant peak will be red-shift as the concentration of the surrounding environment (calcium chloride, CaCl2) increases, and the sensitivity is 11.4 GHz/M, which makes it a possible application in liquid sensing in terahertz region.
LIU Jing, SHEN Jing-Ling, ZHANG Cun-Lin, ZHAO Yue-Jin. Photo-excited tunable metamaterial and its sensing application[J]. Journal of Infrared and Millimeter Waves,2020,39(4):430~433Copy