Compact refractive index sensor based on an S-tapered fiber probe

• DOI: 10.1364/ome.8.000919
• Publication Date: 2018-03-15T16:42:42Z
• Authors: Chao Chen; Rui Yang; Xuan-yu Zhang; Wei-hua Wei; Qi Guo; Xing Zhang; Li Qin; Yong-qiang Ning; Yong-sen Yu
• Keywords: Reflection

We have demonstrated a refractive index (RI) sensor based on an S-tapered fiber probe (STFP) with silver mirror its end facet. The has compact size of about 1 mm, making it proper for sensing in narrow or limited space. reflection spectra the STFPs different structure lengths been analyzed and simulated. Its RI sensitivity range 1.332 ~1.387 reaches 268.8 nm/RI unit, which is 9 times higher than that existing reflective fiber-taper-based sensor. Furthermore, thermal response experimental results show STFP temperature insensitive.