Coherent Control of Propagation Modes in Plasmonic Waveguides

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  • プラズモニック導波路における伝搬モードのコヒーレント制御
  • プラズモニック ドウハロ ニ オケル デンパン モード ノ コヒーレント セイギョ

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Abstract

A plasmonic waveguide is a promising candidate for nano-optical waveguides. First we review the principles and unique characteristics of plasmonic waveguides and compare them to conventional dielectric waveguides. Then, we demonstrate the propagation of a surface plasmon polariton along a metal slab waveguide. A symmetric metal slab waveguide simultaneously supports two opposite types of a surface plasmon mode similar to a metal film: short-range and long-range type modes. The strong field confinement of the short-range mode plays a crucial role in nano-optical waveguides. To avoid the trade-off between field confinement and propagation length, we demonstrate selective mode excitation and mutual mode conversion for superfocusing mediated by the long-range mode.

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