Photonics Research, 2017, 5 (2): 02000103, Published Online: Sep. 26, 2018
High sensitivity D -shaped hole fiber temperature sensor based on surface plasmon resonance with liquid filling
Abstract
A high sensitivity D -shaped hole double-cladding fiber temperature sensor based on surface plasmon resonance (SPR) is designed and investigated by a full-vector finite element method. Within the D -shaped hole double-cladding fiber, the hollow D -section is coated with gold film and then injected in a high thermo-optic coefficient liquid to realize the high temperature sensitivity for the fiber SPR temperature sensor. The numerical simulation results show that the peaking loss of the D -shaped hole double-cladding fiber SPR is hugely influenced by the distance between the D -shaped hole and fiber core and by the thickness of the gold film, but the temperature sensitivity is almost insensitive to the above parameters. When the thermo-optic coefficient is 2.8 × 10 4 / ° C , the thickness of the gold film is 47 nm, and the distance between the D -shaped hole and fiber core is 5 μm, the temperature sensitivity of the D -shaped hole fiber SPR sensor can reach to 3.635 nm / ° C .
Sijun Weng, Li Pei, Jianshuai Wang, Tigang Ning, Jing Li. High sensitivity