We report the results of simulations relating to the illumination of a\ud structure consisting of a slab constructed from a 2-D hexagonal array\ud of metal rods with a terahertz frequency source. As a consequence of\ud negative refraction an essentially non-divergent beam pattern is\ud observed. Although the results presented relate to the terahertz regime\ud they should also be applicable at other frequencies. (C) 2008 Optical\ud Society of America
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