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11 September 2006 Characteristics of plasmonic waveguides for coupled wedge plasmons
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We have numerically investigated characteristics of plasmonic waveguides for coupled wedge plasmons (CWPs) consisting two silver wedges separated by a nano gap all on a glass substrate. Three types of waveguides for CWPs on a glass substrate are considered: (1) two metallic wedges on a planar substrate, (2) two metallic wedges built into the substrate and (3) two-folded free-standing metallic wedges. For numerical calculation, we have employed the Drude model for the dielectric constant of silver and the excitation light with the vacuum wavelength of 632.8 nm. The refractive index of the glass ns is fixed at ns = 1.5. We have calculated field distributions in the waveguide as well as dependence on changing the gap w between wedges and the wedge angle θ. CWPs eigenmodes of such structures are shown to exist and propagate along waveguides structures employed here. The propagation constant k//, propagation distance L and the beam area of a CWP depends on w and θ. L and the beam area size for waveguide employed here are in the order of 10 μm and in the range from 10-4 μm2 to 10-1 μm2, respectively. These values mean that waveguides for CWPs have a potential to be utilized for the nano optical waveguides in future.
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Masanobu Haraguchi, David F. P. Pile, Kenzo Yamaguchi, Yosuke Matsuzaki, Naoki Sato, Dmitri K. Gramotnev, Masuo Fukui, and Toshihiro Okamoto "Characteristics of plasmonic waveguides for coupled wedge plasmons", Proc. SPIE 6324, Plasmonics: Nanoimaging, Nanofabrication, and their Applications II, 632405 (11 September 2006);

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