10 September 2014 Imaging of rectified plasmonic fields on nanoantennas with single nanometer precision
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Abstract
Our experiments demonstrate ultrahigh resolution imaging of localized plasmonic fields with a scanning tunneling microscope (STM). Plasmons are optically excited on gold nanoplasmonic antennas, and the fields localize in the nanometer scale voids and chasms between the gold grain boundaries. The plasmon field manifests in the nonlinear tunneling junction as a rectified tunnel current signal, which can be analyzed to produce maps of the plasmon field localization with an unprecedented resolution of 1nm. The experimentally observed signals are conclusively attributed to the plasmon excitation. Extensions of this procedure have the potential to produce plasmonic field distribution maps with angstrom resolution.
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C. J. Firby, C. J. Firby, A. Y. Elezzabi, A. Y. Elezzabi, } "Imaging of rectified plasmonic fields on nanoantennas with single nanometer precision", Proc. SPIE 9163, Plasmonics: Metallic Nanostructures and Their Optical Properties XII, 916313 (10 September 2014); doi: 10.1117/12.2060288; https://doi.org/10.1117/12.2060288
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