Numerical and experimental studies on plasmonic effects associated with a pair of subwavelength holes on metallic thin film

Yasushi Oshikane; Motohiro Nakano; Haruyuki Inoue

doi:10.1117/12.863587

10 September 2010 Numerical and experimental studies on plasmonic effects associated with a pair of subwavelength holes on metallic thin film

Yasushi Oshikane, Motohiro Nakano, Haruyuki Inoue

Author Affiliations +

Proceedings Volume 7757, Plasmonics: Metallic Nanostructures and Their Optical Properties VIII; 77572N (2010) https://doi.org/10.1117/12.863587
Event: SPIE NanoScience + Engineering, 2010, San Diego, California, United States

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.

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Yasushi Oshikane, Motohiro Nakano, and Haruyuki Inoue "Numerical and experimental studies on plasmonic effects associated with a pair of subwavelength holes on metallic thin film", Proc. SPIE 7757, Plasmonics: Metallic Nanostructures and Their Optical Properties VIII, 77572N (10 September 2010); https://doi.org/10.1117/12.863587

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KEYWORDS

Thin films

Finite element methods

Nanostructures

Near field scanning optical microscopy

Radio propagation

Near field optics

Metals

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