Refractometric sensors based on multimode interference in a thin-film coated single-mode-multimode-single-mode structure with reflection configuration

被引：25
|
作者：
Del Villar, Ignacio [1 ]
Socorro, Abian B. [1 ]
Corres, Jesus M. [1 ]
Arregui, Francisco J. [1 ]
Matias, Ignacio R. [1 ]
机构：
[1] Univ Publ Navarra, Elect & Elect Engn Dept, Pamplona 31006, Spain
来源：
APPLIED OPTICS | 2014年 / 53卷 / 18期
关键词：
SMS FIBER STRUCTURE; FABRY-PEROT-INTERFEROMETER; SENSITIVITY ENHANCEMENT; TRANSITION; GRATINGS;
D O I：
10.1364/AO.53.003913
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Thin-film coated single-mode-multimode-single-mode (SMS) structures have been analyzed both theoretically and experimentally with the aim of detecting different refractive indices. By adequate selection of the thickness of the thin film and of the diameter of the multimode segment in the SMS structure, a seven-fold improvement can be obtained in the sensitivity of the device to the surrounding medium refractive index, achieving a maximum sensitivity of 1199.18 nm/refractive index unit for the range of refractive indices from 1.321 to 1.382. Using layer-by-layer self-assembly for deposition, both on the cladding and on the tip of the multimode segment, allows the reflected power to increase, which avoids the application of a mirror on the tip of the multimode segment. (C) 2014 Optical Society of America
引用
收藏
页码：3913 / 3919
页数：7
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