Site and lattice resonances in metallic hole arrays

TL;DR

This paper presents an analytical study of light transmission through metallic hole arrays, revealing how localized and lattice resonances can enhance or suppress transmission, with experimental validation of high-index fillings.

Contribution

It introduces a new analytical approach to understand and predict transmission phenomena in subwavelength hole arrays, including the effects of filling holes with high-index materials.

Findings

Full transmission is achievable in narrow-hole arrays.

Localized resonances can be enhanced by high-index fillings.

Experimental observation confirms theoretical predictions.

Abstract

A powerful analytical approach is followed to study light transmission through subwavelength holes drilled in thick perfect-conductor films, showing that full transmission (100%) is attainable in arrays of arbitrarily narrow holes as compared to the film thickness. The interplay between resonances localized in individual holes and lattice resonances originating in the array periodicity reveals new mechanisms of transmission enhancement and suppression. In particular, localized resonances obtained by filling the holes with high-index-of-refraction material are examined and experimentally observed through large enhancement in the transmission of individual holes.