Open AccessUltra-high sensitivity SPR temperature sensor based on a helical-core fiber
Author(s) -
Xianbin Wang,
Hongchang Deng,
Libo Yuan
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.428199
Subject(s) - materials science , sensitivity (control systems) , refractive index , fiber optic sensor , core (optical fiber) , surface plasmon resonance , optical fiber , optics , polydimethylsiloxane , optoelectronics , fiber , photonic crystal fiber , graded index fiber , wavelength , nanotechnology , electronic engineering , composite material , physics , nanoparticle , engineering
A novel compact ultra-high sensitivity optical fiber temperature sensor based on surface plasmon resonance (SPR) is proposed and demonstrated. The sensor is fabricated by employing a helical-core fiber (HCF), which is polished as a D-type fiber on the helical-core region and coated with a layer of Au-film and polydimethylsiloxane (PDMS). The theoretical and experimental results show that the resonant wavelength and sensitivity of the proposed sensor can be effectively adjusted by changing the twisting pitch of HCF. Due to the high refractive index sensitivity of the sensor and the high thermo-optic coefficient of PDMS, the maximum sensitivity can reach -19.56 nm/°C at room temperature when the twist pitch of HCF is 2.1 mm. It is worth noting that the sensitivity can be further improved by using a shorter pitch of HCF. The proposed SPR temperature sensor has adjustable sensitivity, is easy to realize distributed sensing, and has potential application prospects in biomedical, healthcare, and other fields.