Microdisk Resonator With Negative Thermal Optical Coefficient Polymer for Refractive Index Sensing With Thermal Stability
In this paper, we propose a microdisk resonator with negative thermal optical coefficient (TOC) polymer for refractive index (RI) sensing with thermal stability. The transmission characteristics and sensing performances by using quasi-TE<sub>01</sub> and quasi-TM<sub>01</sub> modes are simulated by a three-dimensional finite element method. The influences of the TOC, RI, and thickness of the polymer on the sensing performances are also investigated. The simulation results show that the RI sensitivity <italic>S<sub>n</sub></italic> and temperature sensitivity <italic> S<sub>T</sub></italic> with different polymers are in the ranges of 25.1–26 nm/RIU and 67.3–75.2 pm/K for the quasi-TE<sub>01</sub> mode, and 94.5–110.6 nm/RIU and 1.2–51.3 pm/K for the quasi-TM<sub>01 </sub> mode, respectively. Moreover, figure-of-merit of the temperature sensing for the quasi-TM<sub>01</sub> mode is in the range of 2 × 10<sup>−4</sup>–8 × 10<sup>–3</sup>, which can find important application in the implementation of the adiabatic devices.