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Proceedings Paper

Numerical and experimental studies on plasmonic effects associated with a pair of subwavelength holes on metallic thin film
Author(s): Yasushi Oshikane; Motohiro Nakano; Haruyuki Inoue
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Paper Abstract

Optical characteristic of a pair of subwavelength holes on metallic thin film has been studied by numerical simulation and FIB-assisted experiment. Each hole is in a square shape with four corners having fillets. One hole is set up adjascent to another by bringing the most pointed corners close to each other. As a result, a dividing wall between the holes has two v-channels on the both sides. When the hole pair is illuminated with laser beam having linear polarization perpendicular to alignment of the holes, surface plasmon polaritons (SPPs) are excited at the bottom of v-channels and propagate to the other edges of holes. Such the SPPs converge at the end of dividing wall and create a highly localized optical near-field like a point light source. The formation of intense spot is studied with systematic configuration and excitation parameters for the two holes by (1) three-dimensional electromagnetic field analysis for multi-layered model including the two holes, and (2) two-dimensional mode analysis for infinite metallic rod waveguide having the two holes near the center of itself, which are based on the proven finite element method (FEM) to solve partial differential equations (PDEs) for electromagnetic waves.

Paper Details

Date Published: 11 September 2010
PDF: 6 pages
Proc. SPIE 7757, Plasmonics: Metallic Nanostructures and Their Optical Properties VIII, 77572N (11 September 2010); doi: 10.1117/12.863587
Show Author Affiliations
Yasushi Oshikane, Osaka Univ. (Japan)
Motohiro Nakano, Osaka Univ. (Japan)
Haruyuki Inoue, Osaka Univ. (Japan)


Published in SPIE Proceedings Vol. 7757:
Plasmonics: Metallic Nanostructures and Their Optical Properties VIII
Mark I. Stockman, Editor(s)

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