Terahertz Guided Mode Resonance Sensing Platform Based on Freestanding Dielectric Materials: High Q-Factor and Tunable Spectrum

We theoretically investigated a polyethylene-based rectangular and guided mode resonance (GMR) structure with a circular pattern by using the finite-difference time-domain (FDTD) method in the terahertz region. As the refractive index of the grating decreased, the resonance frequency increased, and...

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Bibliographic Details
Published in:Applied sciences 2020-02, Vol.10 (3), p.1013
Main Authors: Shin, Hee Jun, Ok, Gyeongsik
Format: Article
Language:English
Subjects:
Dielectrics
finite-difference time-domain (fdtd)
guided mode resonance sensor
Humidity
Polyethylene
Polyethylenes
q-factor
Refractivity
Resonance
Sensors
Simulation
terahertz
Terahertz frequencies
Thickness
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Summary:We theoretically investigated a polyethylene-based rectangular and guided mode resonance (GMR) structure with a circular pattern by using the finite-difference time-domain (FDTD) method in the terahertz region. As the refractive index of the grating decreased, the resonance frequency increased, and the Q-factor significantly increased because of the change in the effective refractive index. In addition, GMR was investigated with a sensing layer for sensing applications. The resonance frequency and Q-factor could be perfectly modulated by varying the complex refractive index and thickness of the sensing layer. These results indicate that GMR could be applied to highly sensitive label-free detection, using low-cost GMR sensing platforms based on dielectric materials.
ISSN:2076-3417
2076-3417
DOI:10.3390/app10031013