Highly sensitive plasmonic temperature sensor based on Fano resonances in MIM waveguide coupled with defective oval resonator

Abstract

High sensitivity and a large detection range with simple design are highly desirable to realize temperature sensor. A highly sensitive temperature sensor based on Fano resonances in metal-insulator-metal (MIM) waveguide with Nano-wall side-coupled to oval resonator is proposed in this work. The Fano resonance is originated from the coherent coupling and interference between the discrete and the continua state. It shows a different profile, which is typically asymmetric and sharp line, in comparison with the Lorentzian resonance profile. The transmission properties are numerically simulated by finite-difference time-domain method. Structural parameters have a key role in the sensor's sensitivity and transmission spectrum that are studied to systematically analyze the sensing characteristics of such structure. The results of our study indicate that there exist Four-fano resonance peaks in the transmission spectrum. All of which has a linear relationship with the refractive index of the analyte under sensing. Through the optimization of structural parameters, sensitivity of 2.463 nm∕ • C is achieved, indicating the designed sensor can pave the way in the nano-integrated plasmonic devices for high-accurate temperature detection.

Breaking the Symmetry of a Metal–Insulator–Metal-Based Resonator for Sensing Applications

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