Abstract
In this study, a plasmonic structure based on metal-insulator-metal waveguides and square ring resonators is designed and simulated for temperature sensing. The sensing operation is carried out using an enhancement in the interference of sub-wavelength waves. The effect of various factors, such as the number and geometric dimensions of the resonators, on the sensor's reflection spectrum is thoroughly investigated. The results obtained from the finite-difference time-domain simulations indicate that the sensitivity, figure of merit, and temperature sensitivity values for a square ring resonator are 1281 nm/RIU, 73 RIU−1, and 0.505 nm/°C, respectively. Additionally, by using three square ring resonators, the figure of merit increases to 154 RIU−1. The size of the sensors is smaller than 1 µm2. Due to their highly compact size and desirable sensing characteristics, the proposed sensors have great potential for application in various industrial and medical applications.
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