Comparison of High-Sensitivity Plasmonic Temperature Sensor Based on Photonic Crystal Fiber

In this investigation, we introduce a surface plasmon resonance temperature sensor photonic crystal fiber based (SPR-PCFs). The switching coupling phenomena between single modes within the PCF core that are penetrated with a nematic liquid crystal (NLC) and surface plasmon mode (SPs mode) surrounding nanowires of metals are studied. The metals silver (Ag), gold (Au), and titanium nitride (TiN) are added to the PCF structure separately to generate SPs mode. When the phase matching between the core-guided and SPs modes is fulfilled, they are coupled at a certain resonance wavelength. Based on the simulation, TiN with a PCF structure has a high wavelength sensitivity of 13 nm/°C in the temperature range of 35 to 45 °C with an amplitude sensitivity of 21.90 °C−1, whereas Au has a low value of 2 nm/°C in the temperature range of 25 to 35 °C with an amplitude sensitivity of 32.715 °C−1.