Balloon-like singlemode-tapered multimode-singlemode fiber structure for refractive index sensing

摘要

A novel high sensitivity refractive index sensor based on balloon-like singlemode-tapered multimode-singlemode (STMS) fiber structure has been proposed and experimentally demonstrated. Combining the tapering and bending endows the proposed sensor with large evanescent field, resulting in high sensitivity. Experimental results show that the proposed sensor has an average sensitivity of 1104.75 nm/RIU (RI Unit) in the range of 1.33.1-.41 and a maximum sensitivity of 3374.50 nm/RIU at RI of 1.41.