Theoretical analysis of a highly sensitive SPR temperature sensor based on Ag/TiO2 hyperbolic metamaterials and PDMS film. (December 2022)

• Record Type: Journal Article
• Authors: Li, Jun; Xu, Mingjing; Liu, Jiaxin; Li, Hao; Song, Hongbin; Zhou, Ai
• Is Part Of: Optics & laser technology. Volume 156(2022)
• Publication Date: 2022-12
• Subjects: Surface plasmon resonance -- Hyperbolic metamaterials -- Temperature sensing -- PDMS; Optics -- Periodicals; Lasers -- Periodicals; Electronic journals; 621.366
• DOI: 10.1016/j.optlastec.2022.108610
• Languages: English
• ISSNs: 0030-3992

Abstract

Graphical abstract: Highlights: The resonance wavelength can be tuned to longer wavelength that corresponds to higher temperature sensitivity and obtains better DSD-FOM by adjusting the parameters of the HMMs. Under the same conditions, the temperature sensitivity of the HMMs-SPR sensor is 4 times of Ag-SPR sensor, and the average DSD-FOM is 6 times than that. Abstract: 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/°C at 20 °C, and has an average DSD-FOM of 0.221 °C −1 in the range of 20 °C–70 °C, which is several times higher than that of Ag-SPR sensor.