Yee-mesh-based imaginary-distance propagation method for an arbitrary dielectric interface

摘要

A modified finite-difference formula for an arbitrary dielectric interface is applied to an imaginary-distance propagation method based on Yee's mesh. To demonstrate the validity of the modified formula, we analyze the eigenmode of a step-index circular fiber. A reduction in a discretization error is demonstrated in the evaluation of the field profile. The data obtained from the modified formula agrees with that from a body-of-revolution scheme. Furthermore, we analyze the eigenmode of a sloped-side rib waveguide. The numerical result shows a good correlation with previously published data.