Journal
OPTICS LETTERS
Volume 29, Issue 19, Pages 2306-2308Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.29.002306
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We show measurements and calculations of the terahertz (THz) near field of a metal tip with a specially formed, semicircular apex that allows us to identify the separate contributions of the tip apex and shaft to the measured signal. We find that when the tip-crystal distance is not modulated the measured near-field signal is overwhelmed by contributions from the tip shaft, resulting in a relatively large THz spot size. When the tip-crystal distance is modulated, with subsequent lock-in detection at the modulation frequency, only the near-field distribution of the semicircular apex is observed, resulting in a much smaller THz spot size and thus improved spatial resolution. (C) 2004 Optical Society of America.
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