Abstract
A terahertz (THz) thermal sensor has been developed by using a periodically corrugated gold waveguide. A defect was positioned in the middle of this waveguide. The periodicities of waveguides can result in Bragg and non-Bragg gaps with identical and different transverse mode resonances, respectively. Due to the local resonance of the energy concentration in the inserted tube, a non-Bragg defect state (NBDS) was observed to arise in the non-Bragg gap. It exhibited an extremely narrow transmission peak. The numerical results showed that by using the here proposed waveguide structure, a NBDS would appear at a resonance frequency of 0.695 THz. In addition, a redshift of this frequency was observed to occur with an increase in the ambient temperature. It was also found that the maximum sensitivity can reach 11.5 MHz/K for an optimized defect radius of 0.9 times the mean value of the waveguide inner tube radius, and for a defect length of 0.2 (or 0.8) times the corrugation period. In the present simulations, a temperature modification of the Drude model was also used. By using this model, the thermal sensing could be realized with an impressive sensitivity. This THz thermal sensor is thereby very promising for applications based on high-precision temperature measurements and control.
Highlights
The terahertz (THz) wave is part of the electromagnetic wave with a frequency range of 0.1–10 THz
Simulations were thereby performed at temperatures, T, A THz thermal sensor, based on a defect-containing periodic waveguide, has been proposed in that were increased from 273 K to 353 K
When a defect is introduced in the structure, a defect state can be formed it can be seen that the transmission peak shifts to a lower frequency as the defect length, L, increases in the non-Bragg band gap
Summary
The terahertz (THz) wave is part of the electromagnetic wave with a frequency range of 0.1–10 THz. It is obvious that the first mode plays a major role for the Bragg defect state, while the other modes are all sufficiently small It is the other coefficient of Au, α, the period, Λ, and mean radius, r0 , of the proposed waveguide, the following temperature dependencies can be obtained: Λ(T ) = (1 + α∆T )Λ (3).
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