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26 August 2008 Near-field studies of surface plasmon generation: optical and terahertz studies
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We study the dielectric constant dependent diffraction phenomena of single slit apertures, both theoretically and experimentally. We experimentally simulate perfect metal and real metal cases by investigating subwavelength diffraction by a single slit, both in nano-optical and in terahertz regimes, keeping the slit-width/wavelength ratio approximately the same for both of frequency regimes. The wave-front in optical regime separates itself into forward propagating beam and surface-bound 90-degree diffracted wave, i.e., surface plasmon polaritons; while the separation of modes is not observed in terahertz regime.
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H. W. Kihm, K. G. Lee, M. A. Seo, K. J. Ahn, A. J. L. Adam, J. H. Kang, Q. H. Park, P. C. M. Planken, and D. S. Kim "Near-field studies of surface plasmon generation: optical and terahertz studies", Proc. SPIE 7032, Plasmonics: Metallic Nanostructures and Their Optical Properties VI, 70321P (26 August 2008);

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