Temperature Sensor Based on Surface Plasmon Resonance with TiO2-Au-TiO2 Triple Structure

Abstract

Temperature sensors have been widely applied in daily life and production, but little attention has been paid to the research on temperature sensors based on surface plasmon resonance (SPR) sensors. Therefore, an SPR temperature sensor with a triple structure of titanium dioxide (TiO2) film, gold (Au) film, and TiO2 nanorods is proposed in this article. By optimizing the thickness and structure of TiO2 film and nanorods and Au film, it is found that the sensitivity of the SPR temperature sensor can achieve 6038.53 nm/RIU and the detection temperature sensitivity is −2.40 nm/°C. According to the results, the sensitivity of the optimized sensor is 77.81% higher than that of the sensor with pure Au film, which is attributed to the TiO2(film)-Au-TiO2(nanorods) structure. Moreover, there is a good linear correlation (greater than 0.99) between temperature and resonance wavelength in the range from 0 °C to 60 °C, which can ensure the detection resolution. The high sensitivity, FOM, and detection resolution indicate that the proposed SPR sensor has a promising application in temperature monitoring.

Highly Sensitive Multichannel Fano Resonance-Based Plasmonic Sensor for Refractive Index and Temperature Sensing Application

“…Here T 0 = 20 • C (room temperature), and T is the ambient temperature. When ethanol is employed as the measuring liquid, the sensor's operating temperature range is between −114.3 and 78 • C [51]. Table 1 shows the basic formulas used in this work.…”

Visible-Range Multiple-Channel Metal-Shell Rod-Shaped Narrowband Plasmonic Metamaterial Absorber for Refractive Index and Temperature Sensing

“…The RI of ethanol can be expressed as [ 63 ]: n = 1.36048 − 3.94 × 10 −4 ( T − T 0 ) where T 0 = 20 °C and T is the ambient temperature. When ethanol is employed as the measuring liquid, the sensor's operating temperature range is −114.3 ≤ T ≤ 78 °C [ 64 ]. Table 1 shows the basic formulas used in this work.…”

Design and Simulation of Au/SiO2 Nanospheres Based on SPR Refractive Index Sensor

“…Surface plasmon resonance (SPR) sensors are sensitive to changes in the refractive index of the medium in contact with the metal film, and when the refractive index of the medium changes, the resonance wavelength or angle will be changed, thus realizing the detection of a specific medium [ 1 , 2 , 3 ]. SPR sensors are widely used in food safety [ 4 , 5 ], biology [ 6 , 7 , 8 ], and gas and temperature monitoring [ 9 , 10 , 11 , 12 ] because of their label-free detection, low cost, real-time measurement, and high sensitivity. SPR sensors include prism coupling [ 13 , 14 , 15 ], waveguide coupling [ 16 ], fiber coupling [ 17 , 18 , 19 ], and grating coupling [ 20 ].…”