Antenna effects in terahertz apertureless near-field optical microscopy

Wang, Kanglin; Mittleman, Daniel M.; van der Valk, Nick C. J.; Planken, Paul C. M.
October 2004
Applied Physics Letters;10/4/2004, Vol. 85 Issue 14, p2715
Academic Journal
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 a near-field detection technique and a far-field detection technique. Using a dipole antenna model, it is shown how the observed effects can be explained by the signal filtering properties of the metal tips used in the experiments.


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