Abstract
In this paper, we proposed a miniaturized, simple, highly sensitive, and high-precision gas sensor for the measurement of concentration of methane. This gas sensor is based on the inclusion of a cryptophane-E cavity in a one-dimensional perfect photonic crystal (PC) composed by alternating layers of Silicon (Si) and Air. The detection principle of this sensor based on the variation of the refractive index (RI) of cryptophane E due to a change in the concentration of methane which induces a shift in resonant wavelength of the cavity (cavity states) in the band gaps, allowing precision and efficient measurement of methane concentration. The band structure and the transmission spectrum are both calculated by the Green function method (GFM). Numerous geometrical and physical parameters like the thickness of the cavity layer and the concentration of methane gas are properly optimized to envisage high sensing performances. The numerical results show that the photonic cavity state (defect mode), which appears in the band gap, is caused by the infiltration of methane into the cryptophane E middle layer. This cavity state can be used for detection purposes in environmental monitoring. The cavity state wavelength is sensitive to the cryptophane E-methane mixture and a variation in the refractive index as ∆n = 10–3 can be detected. The limit of detection value of the proposed sensor is approximately 10–3 refractive index unit, which is very low, as is always expected for chemical sensing designs. This system could be employed for monitoring in the environmental field, for detection of dangerous and/or air polluting gas concentrations, and for liquid analysis with excellent performance.
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Ben-Ali, Y., El Kadmiri, I., Errouas, Y. et al. High Sensibility Optical Methane Sensor Based on Insertion of Cryptophane-E Cavity in 1D Photonic Crystal. Opt. Mem. Neural Networks 31, 403–412 (2022). https://doi.org/10.3103/S1060992X22040063
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DOI: https://doi.org/10.3103/S1060992X22040063