KEYWORDS: Terahertz radiation, Near field optics, Near field, Metals, Gold, Light scattering, Near field scanning optical microscopy, Diffraction, Polarization, Surface plasmons
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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