Surface plasmons of metallic surfaces perforated by nanoholes

TL;DR

This paper demonstrates that extraordinary optical transmission through perforated metallic surfaces is caused by surface-plasmon-polariton modes, with simulations confirming experimental results and revealing the hybrid nature of these modes' near-field effects.

Contribution

The study provides a detailed simulation-based analysis identifying the specific SPP modes responsible for enhanced transmission in perforated metallic films.

Findings

Simulations agree with experimental data on optical transmission.

Surface-plasmon-polariton modes are key to extraordinary transmission.

Near-field analysis shows hybrid collective and localized effects.

Abstract

Recent works dealt with the optical transmission on arrays of subwavelength holes perforated in a thick metallic film. We have performed simulations which quantitatively agree with experimental results and which unambiguously evidence that the extraordinary transmission is due to the excitation of a surface-plasmon-polariton (SPP) mode on the metallic film interfaces. We identify this SPP mode and show that its near-field possesses a hybrid character, gathering collective and localised effects which are both essential for the transmission.