Theoretical research of gas sensing method based on photonic crystal cavity and fiber loop ring -down technique

SENSORS AND ACTUATORS B-CHEMICAL

卷:228

Article

Qian, Xiaolong¹  Zhao, Yong^1,2  Zhang, Ya-nan¹  Wang, Qi¹ 

[1] Northeastern Univ, Coll Informat Sci & Engn, Shenyang 110819, Peoples R China

[2] State Key Lab Synthet Automat Proc Ind, Shenyang 110819, Peoples R China

关键词: Photonic crystal cavity;    Slow light;    Fiber loop ring-down;    Gas concentration;   

DOI  :  10.1016/j.snb.2016.01.087

来源: Elsevier

【 摘 要 】

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 mu s/% and the minimum detectable concentration can be as accurate as 2.37 ppm. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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