Browsing by Author "Thomas, S.K."

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    Indium Antimonide-Based All-Dielectric Metasurface Absorber at Terahertz Frequency for Refractive Index Sensing Applications
    (Institute of Electrical and Electronics Engineers Inc., 2024) Thomas, S.K.; Shenoy, A.; Satyanarayan, M.N.
    In this article, we present an indium antimonide (InSb)-based metasurface absorber (MA) using a complementary ring structure. The proposed MA exhibits absorption characteristics in the terahertz frequency range spanning from 1.0 to 2.2 THz. Within this frequency range, the MA demonstrates dual-band tunability, achieving approximately 100% absorption. Geometric parameters such as the outer ring radii, ring width, and InSb layer thickness are systematically adjusted to fine-tune the absorption frequency of the MA. In addition, we explore the refractive index sensing capabilities by introducing different refractive index materials into the air-filled complementary ring cavity. Notably, we achieve a peak refractive index sensitivity of 555 GHz per refractive index unit (RIU) for the first absorption peak at a minimum radius of 60 µm. © 2001-2012 IEEE.