Theoretical analysis of a highly sensitive SPR temperature sensor based on Ag/TiO2 hyperbolic metamaterials and PDMS film

We proposed and theoretically investigated a highly sensitive surface plasmon resonance (SPR) temperature sensor. The sensor is composed of a tapered no-core fiber (TNCF) deposited with hyperbolic metamaterials (HMMs) and a layer of polydimethylsiloxane (PDMS). The resonance wavelength can be tuned to longer wavelength that corresponds to higher temperature sensitivity and obtains a better product of depth of dip and figure of merit (DSD-FOM) by adjusting the parameters of the HMMs. The PDMS coated on the surface of the HMMs can further improve the temperature sensitivity due to its high thermal-optic coefficient. Simulation results show that the optimized temperature sensitivity can reach-16.26 nm/& DEG;C at 20 & DEG;C, and has an average DSD-FOM of 0.221 & DEG;C-1 in the range of 20 & DEG;C-70 & DEG;C, which is several times higher than that of Ag-SPR sensor.

Automated summary

We proposed a highly sensitive surface plasmon resonance temperature sensor by adjusting parameters and coating the surface to enhance temperature sensitivity. The simulation results showed that the sensor had a temperature sensitivity of -16.26 nm/°C at 20°C and a high DSD-FOM in the range of 20°C-70°C.