Chiral metamaterial based on I-K-structured InSb for sensing applications

In this paper, a chiral metamaterial based on I-K-structured indium antimonide (InSb) is proposed, which can obtain double circular dichroism (CD) peaks of 0.82 and −0.65 in the range of 1.7 to 2 THz. The device consists of the temperature control material InSb and its copper substrate. The I-K structure facilitates refractive index sensing sensitivity up to 1200 GHz/RIU for the purpose of refractive index detection (RI from 1.3 to 1.39), while the linked I-K structure increases the maximum sensitivity to 1280 GHz/RIU. In addition, the performance of CDs can be regulated by controlling changes in device temperature, with a maximum temperature sensing sensitivity of 7.8 GHz/K. The proposed chiral metamaterials based on InSb have considerable potential for application in the fields of biosensing, environmental monitoring, and wavefront manipulators.