Finite-Difference Time-Domain Method (FDTD) used to simulate Micro-ring resonator for student applications

摘要

In this paper we used the Finite Difference Time-Domain Method (FDTD) to solve Maxwell equations in micro-ring resonator filter. The usefulness of micro-ring resonator has been demonstrated through the variety of applications ranging from optical filters to biological and environmental sensing. Because the transmission spectrum is highly sensitive to the refractive index changes in the surrounding media, these micro-rings were used to detect cancer molecules (University of Illinois). The simulations based on this mathematical model are very suitable to describe the losses in different types of micro-ring resonators. The simulations were made for a single ring and for two rings coupled to a single waveguide at diffrent wavelengths, diffrent refractive index and diffrent widths in order to reduce the losses. It is also described the quality of the coupling for diffrent wavelengths.The obtained result refers to the simulation of amplitude for single resonating micro-ring filters and for multiple micro-rings filters. The object of this paper is to establish that this method can be useful for both designers and students performing numerical simulations as computer experiments.