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Wang, K. (author), Mittleman, D.M. (author), Van der Valk, N.C.J. (author), Planken, P.C.M. (author)We have performed measurements on terahertz (THz) apertureless near-field microscopy that show that the temporal shape of the observed near-field signals is approximately proportional to the time-integral of the incident field. Associated with this signal change is a bandwidth reduction by approximately a factor of 3 which is observed using both...journal article 2004