Open AccessHighly sensitive differential fiber-optic SPR sensor in telecom band
Author(s) -
Songquan Li,
Laixu Gao,
Qian Yang,
Chen Zou,
Feng Liang,
Changqing Tian,
Zesong wang,
Xiaoshan Tang,
Yanxiong Xiang
Publication year - 2020
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.387413
Subject(s) - optics , sensitivity (control systems) , prism , materials science , refractive index , fiber optic sensor , optical fiber , signal (programming language) , optoelectronics , physics , computer science , electronic engineering , engineering , programming language
We proposed a differential fiber-optic SPR remote sensor with ultra-high sensitivity in telecom band. The working band of the sensor is designed as the C-band which is the low loss band of optical fiber communication aiming to improve the sensitivity and enable the capability of remote monitoring. The sensor head is a BK7 prism coated with Au/TiO 2 films, enabling two channels for differential intensity interrogation. The intensities of the reflected lights through the channels vary oppositely within the measurement range of refractive index. Due to the sharp dip of angular resonant response in the C-band, the differential signal produces a steep slope as the refractive index of the sample varies, thus higher sensitivity is expected in a narrow measurement range. According to the results, the sensitivity is as high as 456 V/RIUs within the narrow measurement range of 1.3×10 -2 RIUs and the resolution reaches to 6×10 -6 RIUs. The measurement range can be tuned conveniently by adjusting the thickness of TiO 2 film and can be expanded by increasing the number of sensing channels, which provides great convenience for the application of biosensor requiring high sensitivity.