Affiliation:
1. Nanjing Xiaozhuang University
2. Shizuoka University
Abstract
A temperature-insensitive high-sensitivity refractive index sensor is proposed and experimentally demonstrated, which is based on utilization of a thinned helical fiber grating but with an intermediate period (THFGIP). Attributed to the reduced diameter and an intermediate period of the grating, the proposed sensor has a high surrounding refractive-index (SRI) sensitivity and a low temperature sensitivity. The average SRI sensitivity of the proposed sensor is up to 829.9 nm/RIU in the range of 1.3410–1.4480 RIU. Moreover, unlike the traditional sensitivity-enhancement method by increasing the waveguide dispersion factor, here the waveguide dispersion factor at the resonant wavelength was decreased by reducing the diameter of the fiber grating and as a result, the crosstalk effect due to the temperature change can be further suppressed. The proposed temperature-insensitive SRI sensor has the superiorities of simple structure, ease fabrication, and low cost, which could be found more potential applications in the SRI sensing fields.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China
Japan Society for the Promotion of Science
Natural Science Research of Jiangsu Higher Education Institutions of China
Postgraduate Practice and Innovation Program of Jiangsu Province
Subject
Atomic and Molecular Physics, and Optics