Accurate simulation of light transmission through subwavelength apertures in metal films

TL;DR

This paper presents a highly accurate finite-element simulation method for light transmission through subwavelength apertures in metal films, achieving significantly lower error rates and analyzing the effects of aperture rounding.

Contribution

It introduces an improved simulation approach with lower error margins and investigates the impact of aperture corner and edge rounding on light transmission.

Findings

Relative error of transmissivity below 0.01%

Order of magnitude improvement over previous results

Corner and edge rounding influence on transmission analyzed

Abstract

We use the finite-element method for simulating light transmission through a 2D-periodic array of rectangular apertures in a film of highly conductive material. We report results with a relative error of the transmissivity lower than 0.01%. This is an improvement of about one order of magnitude compared to previously reported results. Further, the influence of corner and edge roundings on light transmission through the subwavelength apertures is investigated.