A super continuum characterized high-precision SPR fiber optic sensor for refractometry

摘要

Here we introduce a high sensitive side-polished fiber optic based surface plasmon resonance (SPR) sensor for refractometry in liquids for 1.32-1.37 Refractive Index Unit (RIU). In fabrication, a Controllable Hybrid Polishing Method (CHPM) was used to make high quality D-shaped fibers. For characterization, a super continuum (SC) light source was used in the measurement setup. The sensor has a spectral sensitivity of 5200 nm/RIU with a Limit of Detection (LOD) of 5.8 x 10(-6) RIU. Also, we have demonstrated that by reducing the intensity noise in our light source, a Signal-to-Noise Ratio (SNR) of 12.6 dB and a Limit of Detection (LOD) of 3.7 x 10(-6) RIU is achievable in an intensiometric approach. (C) 2015 Elsevier B.V. All rights reserved.