Journal
APPLIED PHYSICS LETTERS
Volume 85, Issue 14, Pages 2715-2717Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1797554
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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. (C) 2004 American Institute of Physics.
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