Propagation effects in apertureless near-field optical antennas
نویسندگان
چکیده
We report a direct observation of the electromagnetic wave propagation on optical antennas. A free-space broadband terahertz pulse is coupled into a propagating mode along the shaft of an optical antenna acting as an apertureless near-field probe. We determine the spatial extent of this guided mode and its velocity. In addition, we consider the possibility of multiply reflected modes propagating along the near-field probe, an effect which will be significant in near-field spectroscopic measurements. © 2004 American Institute of Physics. @DOI: 10.1063/1.1640473#
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