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We analyse the coupling of THz radiation to a GaAs waveguide through a metallic grating with sub-wavelength slits. This result is compared to the coupling through a sub-wavelength-sized aperture in a chromium mask to a diffraction-free layered superlens at visible wavelengths. We demonstrate efficient coupling of a plane-wave to the multilayer. The mode resembles a ray - a term usually reserved for geometric-optics, and unknown to nano-optics. However, the width of the mode is sub-wavelength and the propagation direction is determined by the normal direction to the layer boundaries.
Date of Conference: 26-30 June 2011