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Theoretical research of gas sensing method based on photonic crystal cavity and fiber loop ring-down technique.
- Source :
-
Sensors & Actuators B: Chemical . Jun2016, Vol. 228, p665-672. 8p. - Publication Year :
- 2016
-
Abstract
- A high-sensitive gas sensing method is proposed, in which miniaturized photonic crystal (PC) cavity is utilized as the sensing element, and cryptophane E molecular is infiltrated in defected holes of PC cavity as the sensitive material to methane gas. Particularly, slow light in side-coupled PC waveguide is optimized to enhance refractive index sensitivity of the PC cavity and fiber loop ring-down technology is used to demodulate output resonant spectrum of the sensing system. Simulation results demonstrate that a refractive index sensitivity of 450 nm/RIU and a quality factor of 1105 can be obtained in the slow light engineered PC cavity. For measurement of methane concentration, the theoretical sensitivity can be up to 4.21 μs/% and the minimum detectable concentration can be as accurate as 2.37 ppm. [ABSTRACT FROM AUTHOR]
- Subjects :
- *GAS detectors
*PHOTONIC crystals
*CRYPTOPHANE
*CRYSTAL defects
*REFRACTIVE index
Subjects
Details
- Language :
- English
- ISSN :
- 09254005
- Volume :
- 228
- Database :
- Academic Search Index
- Journal :
- Sensors & Actuators B: Chemical
- Publication Type :
- Academic Journal
- Accession number :
- 113477882
- Full Text :
- https://doi.org/10.1016/j.snb.2016.01.087