부산대학교 도서관

A terahertz metamaterial absorption sensor with polarization insensitivity and dual-band characteristics is designed and analyzed in this paper. The proposed sensor produces two absorption peaks at 0.73 and 2.2 THz, with absorptivity up to 99.8%, and their Q-factor is 22.8 and 40.7, respectively. In addition, when the refractive index is 1.4, and the THz wave is vertically incident, by varying the thickness of the analyte layer in the range of 1–8 μ m, we get the average thickness sensitivity of the two absorption peaks is 4.1 and 11.7 GHz/ μ m. Further, when the analyte layer thickness is 10 μ m, and the THz wave is vertically incident, too, by changing the RI in the range of 1–2, the average refractive index sensitivity of the two absorption peaks is 163 and 488 GHz/RIU with the figure of merit (FOM) are 5.09 and 9.04, respectively. Furthermore,we modified the structure to improve the refractive index sensitivity of the two absorption peaks to 319 and 1015 GHz/RIU. Therefore, this absorber can be used in nondestructive testing due to the above characteristics. [ABSTRACT FROM AUTHOR]