Photo-excited tunable metamaterial and its sensing application
投稿时间:2019-09-29  修订日期:2020-07-27  download
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刘婧 北京理工大学 光电学院 
沈京玲 首都师范大学 太赫兹光电子学教育部重点实验室  
张存林 北京理工大学 光电学院  
赵跃进 北京理工大学 光电学院  
Abstract: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.
keywords:terahertz  metamaterial  liquid sensor
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Copyright:《Journal of Infrared And Millimeter Waves》