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Guestin, L. (author), Adam, A.J.L. (author), Knab, J.R. (author), Nagel, M. (author), Planken, P.C.M. (author)We have studied theoretically and experimentally the influence of a dielectric substrate on the frequency-dependent terahertz electric near-field of a small hole in a metal layer. We find that the near-field transmission spectrum and the two-dimensional field distribution of an empty hole in a thin metal layer on a substrate are almost identical...journal article 2009