Abstract
A refractive index sensor based on the thinned and microstructure fiber Bragg grating (ThMs-FBG) was proposed and realized as a chemical sensing. The numerical simulation for the reflectance spectrum of the ThMs-FBG was calculated and the phase shift down-peak could be observed from the reflectance spectrum. Many factors influencing the reflectance spectrum were considered in detail for simulation, including the etched depth, length, and position. The sandwich-solution etching method was utilized to realize the microstructure of the ThMs-FBG, and the photographs of the microstructure were obtained. Experimental results demonstrated that the reflectance spectrum, phase shift down-peak wavelength, and reflected optical intensity of the ThMs-FBG all depended on the surrounding refractive index. However, only the down-peak wavelength of the ThMs-FBG changed with the surrounding temperature. Under the condition that the length and cladding diameter of the ThMs-FBG microstructure were 800 and , respectively, and the position of the microstructure of the ThMs-FBG is in the middle of grating region, the refractive index sensitivity of the ThMs-FBG was ∕refractive index unit with the wide range of 1.33–1.457 and a high resolution of . The temperature sensitivity was , which was approximately equal to that of common FBG.
© 2008 Optical Society of America
Full Article | PDF ArticleMore Like This
Pouneh Saffari, Zhijun Yan, Kaiming Zhou, and Lin Zhang
Appl. Opt. 51(20) 4715-4721 (2012)
Biqiang Jiang, Meng Xue, Chenyang Zhao, Dong Mao, Kaiming Zhou, Lin Zhang, and Jianlin Zhao
Appl. Opt. 55(25) 7037-7041 (2016)
Qiang Ling, Zhengtian Gu, and Kan Gao
Appl. Opt. 57(10) 2693-2697 (2018)