ITO-Silver SPR Single-Channel Dual Sensor

An optical fiber surface plasmon resonance (SPR) sensor is proposed for simultaneous temperature and refractive index (RI) measurements. The sensor utilizes a multimode fiber coated with a thin metal layer of ITO and Ag. The sensor produces two wavelength dips, due to SPR and lossy mode resonance (LMR), that changes linearly with temperature and RI. The second dip is utilized to achieve higher accuracy and solve the cross-sensitivity issue. The sensor has RI sensitivities of 2,586 nm/RIU and 194.4 nm/RIU, and temperature sensitivities of -31.72 pm/K and -13.49 pm/K, respectively.