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Applied Physics Letters / Volume 94 / Issue 16 / STRUCTURAL, MECHANICAL, THERMODYNAMIC, AND OPTICAL PROPERTIES OF CONDENSED MATTER

Appl. Phys. Lett. 94, 161904 (2009); http://dx.doi.org/10.1063/1.3111162 (3 pages)

Splitting of transmission peak due to the hole symmetry breaking

Xiao-gang Yin, Cheng-ping Huang, Zhi-qiang Shen, Qian-jin Wang, and Yong-yuan Zhu

National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, People’s Republic of China

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(Received 10 December 2008; accepted 11 March 2009; published online 20 April 2009)

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 the 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.

© 2009 American Institute of Physics

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KEYWORDS and PACS

Keywords

light transmission, metallic thin films, silver, surface plasmons

PACS

  • 78.66.Bz

    Metals and metallic alloys

  • 73.20.Mf

    Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)

  • 78.20.Ci

    Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)

  • 68.55.-a

    Thin film structure and morphology

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3111162

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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