High-sensitivity, fast-response ethanol gas optical sensor based on a dual microfiber coupler structure with the Vernier effect

被引：6
作者：
Jiang, Yuxuan [1 ]
Yi, Yating [1 ]
Brambilla, Gilberto [2 ]
Wang, Pengfei [1 ,3 ]
机构：
[1] Harbin Engn Univ, Key Lab In Fiber Integrated Opt, Minist Educ China, Harbin 150001, Peoples R China
[2] Univ Southampton, Optoelect Res Ctr, Southampton SO17 1BJ, Hants, England
[3] Shenzhen Univ, Coll Optoelect Engn, Minist Educ & Guangdong Prov, Key Lab Optoelect Devices & Syst, Shenzhen 518060, Peoples R China
来源：
OPTICS LETTERS | 2021年 / 46卷 / 07期
基金：
中国国家自然科学基金;
关键词：
Gas detectors - Chemical sensors - Sensitivity analysis - Polymethyl methacrylates;
D O I：
10.1364/OL.418953
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A high-sensitivity ethanol gas sensor based on two microfiber couplers and the Vernier effect is examined in this Letter using the unique variation rate conversion point characteristics. The output spectrum of the two couplers connected in parallel are superimposed to form a symmetrical envelope curve, showing high responsivity to variations in the external environment. Ethanol sensitivity was achieved by coating the waist region of the coupler with a mixture of Nile red and polymethyl methacrylate. When the concentration of ethanol gas changes, the envelope spectrum shifts. Experimental results show that a high responsivity of 160 pm/ppm can be obtained by tracing the reference peaks in the envelope curve and that the response and recovery times are on the order of seconds. (C) 2021 Optical Society of America
引用
收藏
页码：1558 / 1561
页数：4
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