Splitting of transmission peak due to the hole symmetry breaking

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.

12 pages, 4 figures

References in corpus (4)

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• Dual effect of surface plasmons in light transmission through perforated metal films
• Surface plasmon polaritons assisted diffraction in periodic subwavelength holes of metal films with reduced interplane coupling
• Theory of Transmission of Light by Sub-wavelength Cylindrical Holes in Metallic Films