Gas sensor based on parity-time-symmetry structure

Yi-Chi Zhang; Yun-tuan Fang

doi:10.1117/1.JNP.12.036005

27 July 2018 Gas sensor based on parity-time-symmetry structure

Yi-Chi Zhang, Yun-tuan Fang

Author Affiliations +

Journal of Nanophotonics, Vol. 12, Issue 3, 036005 (July 2018). https://doi.org/10.1117/1.JNP.12.036005

Abstract

The gas concentration can be detected through a parity-time (PT) -symmetry structure. The structure is constructed by placing a resonance cavity between two PT-symmetry Bragg reflectors. The cavity and some specific layers in the structure are filled with the air doped with another gas. The transmittance spectra of the structure are calculated by the transfer matrix method. The peak value of the defect mode is dependent on the concentration of the gas. The sensor detects the gas concentration by the transmittance of the defect mode, instead of the peak wavelength of the defect mode. The defect mode has a large peak value and high Q value because of the amplification effect of the PT-symmetry structure, which apparently enhances the sensor sensitivity.

Citation Download Citation

Yi-Chi Zhang and Yun-tuan Fang "Gas sensor based on parity-time-symmetry structure," Journal of Nanophotonics 12(3), 036005 (27 July 2018). https://doi.org/10.1117/1.JNP.12.036005

Received: 25 May 2018; Accepted: 12 July 2018; Published: 27 July 2018

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