Model for reflection and transmission matrices of nanowire end facets

摘要

Nanowires show a large potential for various electrooptical devices, such aslight emitting diodes, solar cells and nanowire lasers. We present a directmethod developed to calculate the modal reflection and transmission matrix atthe end facets of a waveguide of arbitrary cross section, resulting in ageneralized version of the Fresnel equations. The reflection can beconveniently computed using Fast Fourier Transforms. We demonstrate that thereflection is qualitatively described by two main parameters, the modal fieldconfinement and the average Fresnel reflection of the plane waves constitutingthe waveguide mode.