Optical Tamm state and extraordinary light transmission through a nanoaperture

Abstract

We investigate the light transmission through a nanoaperture in a metal film deposited on a planar metamaterial. An effect of an anomalously high light transmission (up to $800%$) through the nanoaperture is revealed, which we associate with the enhancement of the field at the interface of the planar structure ``metamaterial--metal-film'' due to the appearance of an optical Tamm state. Our numerical results are in qualitative agreement with experimental data.