A multi-purpose sensor based on plasmon-induced transparency in the terahertz range

Abstract

In this paper, an insulator-semiconductor-insulator plasmonic waveguide is proposed based on InSb in the terahertz range. The proposed plasmonic waveguide is an integrated temperature and refractive index sensor. The plasmon-induced transparency used in this integrated sensor reduces the sensor bandwidth by coupling two rolled-up micro-tubes. The sensitivity of the proposed sensor for temperature and refractive index can reach 4388 nm/K and 149.1 μm/RIU, respectively. The sensitivity of the sensor for refractive index is at least 805.95% larger than that of our previous work and the figure of merit is the order of 41.3. The proposed sensor has a wide range of potential lab-on-chip applications and can measure the variations of temperature and refractive index in the material under sensing.