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Adam, A.J.L. (author), Van der Valk, N.C.J. (author), Planken, P.C.M. (author)We present measurements and calculations of the terahertz (THz) electric field measured in the near field of a metal tip used in THz apertureless near-field optical microscopy (THz-ANSOM). An analytical model in which we treat the metal tip as a linear wire antenna allows us to predict almost all of the features observed in the measurements,...journal article 2007