Splitting of transmission peak due to the hole symmetry breaking

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Authors
Yin, Xiao-gang
Huang, Cheng-ping
Shen, Zhi-Qiang
Wang, Qian-jin
Zhu, Yong-yuan
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Abstract
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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.
Comment: 12 pages, 4 figures
Keywords
Physics - Optics
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