Highly Sensitive Refractive Index Sensor Based on an In-Fiber Droplet-Shape Air-Cavity

摘要

We present a highly sensitive refractive index (RI) sensor based on an ultra-compact in-fiber Mach-Zehnder interferometer (MZI) with a droplet-shape air-cavity. The dropletshape air-cavity is fabricated by fusion splicing and single-side fused tapering. T