Abstract
This paper presents an accurate approach to FDTD analysis of whispering gallery modes in dielectric resonators. In those problems resonant frequencies are supposed to be extracted with relative errors below 10−4. It is widely believed that only custom — made software codes, based on mode matching methods, can meet such stringent accuracy requirements. Herein, we demonstrate how the required accuracy can be obtained with a general — purpose FDTD code, run within a new three — step procedure. Advantages of the FDTD approach include more flexibility in modelling scenarios with unusual shapes or / and lossy materials.
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