A Model of a Temporal Method to Determine the Refractive Index Change in a Dual Ring Resonator

This paper describes the simulation and modelling of a novel temporal method to determine the refractive index change in a dual ring micro-ring resonator. The refractive index change information of a covering analyte of the sense resonator is realized as a modulated output signal. Two dimensional Finite difference time domain (FDTD) is used to graphically demonstrate the temporal operation. The beam propagation method (BPM) and the finite element method (FEM) are used to determine coupling coefficients, ring loss and effective index. As a result of the dual ring resonator’s geometrical arrangement, the sensor output undergoes a modulated wavelength (or frequency) shift from the micrometre wavelength (or terahertz frequency) to a centimetre wavelength (or gigahertz frequency) range. BPM and FEM data obtained from partial micro-ring arcs and a derived temporal equation are used in a MATLAB program to model the temporal output. The minimum down converted frequency realized in this model is...