基于二氧化钒的太赫兹超材料多功能吸收器OACHSSCD

Based on the unique phase transition characteristics of vanadium dioxide(VO2),a metamaterial terahertz multifunctional device with absorption-sensing function was designed.The device is composed of five layers,from top to bottom are VO2 pattern layer,PTFE dielectric layer,VO2 pattern layer,PTFE dielectric layer and the bottom metal layer.The results show that when VO2 is in the all-metal state(con-ductivity is 200 000 S·m-1),the device has the absorption function,the absorption rate exceeds 90%and the relative bandwidth reaches 116.6%in the frequency range of 3.9 Thz～14.8 THz.In particular,the absorption rate at 6.4 THz,9.8 THz and 11.0 THz exceeds 99%,achieving perfect absorption.When the conductivity of VO2 is changed so that VO2 is in an insulating state,the design structure can be used as a biosensor with a narrow band absorption peak at 16.26 THz.The absorption rate is close to 90%,the sensitivity reaches 972 GHz/RIU,and the Q value is 81.3.