Splitting of transmission peak due to the hole symmetry breaking

TL;DR

This paper investigates how breaking the symmetry of holes in a metal film affects optical transmission, revealing that asymmetrical waveguide surface-plasmon modes cause the splitting of transmission peaks.

Contribution

It provides both experimental and theoretical evidence that asymmetrical hole shapes induce peak splitting via surface-plasmon modes, advancing understanding of plasmonic transmission phenomena.

Findings

Symmetry breaking causes distinct splitting of transmission peaks.

Surface-plasmon modes are key to the peak splitting.

Experimental and theoretical results are in agreement.

Abstract

We studied experimentally and theoretically the optical transmission through asymmetrical holes of a metal film, which is constructed by introducing small protuberances to the sides of individual square holes. Due to the symmetry breaking of hole shape, an interesting transmission feature appears: both the Ag-glass (1, 0) and Ag-glass (1, 1) peaks split distinctly. Detailed studies indicate that the peak splitting is actually associated with the two asymmetrical waveguide surface-plasmon (WSP) modes confined on the surface of opposite hole walls. The finding demonstrates the crucial role of WSP modes and enriches our understanding of the phenomenon.