High Sensitivity Refractive Index Sensor Based on Indium Antimonide Terahertz Plasmonic Ring Resonator

A high sensitivity refractive index semiconductor-insulator-semiconductor (SIS) waveguide with a ring resonator sensor at THz frequency is proposed. The topological study of the proposed filter is numerically simulated using the finite element method. A maximum sensitivity of 0.509 THz/ Refractive i...

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Bibliographic Details
Published in:IEEE sensors journal 2022-08, Vol.22 (16), p.15916-15922
Main Authors: Thomas, Sherin, Singh, Mandeep, Satyanarayan, M. N.
Format: Article
Language:English
Subjects:
Cavity resonators
Concentric dual ring
Electromagnetic waveguides
Finite element method
Indium antimonide
Optical ring resonators
Optical waveguides
Refractive index
refractive index sensor
Refractivity
Resonant frequency
ring resonator
Rings (mathematics)
semiconductor-insulator-semiconductor (SIS)
Sensitivity
Sensors
Terahertz frequencies
terahertz frequency
Waveguides
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Summary:A high sensitivity refractive index semiconductor-insulator-semiconductor (SIS) waveguide with a ring resonator sensor at THz frequency is proposed. The topological study of the proposed filter is numerically simulated using the finite element method. A maximum sensitivity of 0.509 THz/ Refractive index unit (RIU) is obtained by filling the air-filled ring resonator cavity with different refractive index materials. Besides that, the transmission characteristics are studied by varying the structural dimensions and observed that the system can be treated as a frequency selective device. The device gets modified by incorporating another concentric ring inside the single ring. From the transmission characteristics, the multiple modes of the concentric dual ring are studied, and concluded that the even TM 1 mode shows a better response towards frequency tuning.
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2022.3188512