Open AccessHybrid Fabry-Perot interferometer for simultaneous liquid refractive index and temperature measurement
Author(s) -
Bingjie Xu,
Yi Yang,
Jia Zhang,
D. N. Wang
Publication year - 2017
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.25.014483
Subject(s) - optics , fabry–pérot interferometer , refractive index , materials science , interferometry , astronomical interferometer , wavelength , fiber optic sensor , sensitivity (control systems) , optical fiber , capillary action , single mode optical fiber , reflection (computer programming) , optoelectronics , physics , electronic engineering , computer science , programming language , engineering , composite material
A compact and high sensitivity sensor with a fiber-tip structure is proposed and demonstrated for simultaneously liquid refractive index (RI) and temperature sensing. The device is fabricated by inserting a tiny segment of capillary tube between single-mode fibers (SMFs) to form two cascaded Fabry-Perot interferometers (FPIs). The theoretical and experimental results demonstrate that the ambient liquid RI and temperature can be simultaneously determined by the intensity and shift of the resonant wavelength in the reflection spectrum. Our proposed device has the highest RI sensitivity of ~216.37 dB/RIU at the RI value of 1.30; a high spatial resolution owing to its compact size (with dimension <400 μm) makes it promising for high precision bio/chemical sensing applications.