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Polarization- and wavelength-resolved near-field imaging of complex plasmonic modes in Archimedean nanospirals

Jordan A. Hachtel, Roderick B. Davidson, Elena R. Kovalik, Scott T. Retterer, Andrew R. Lupini, Richard F. Haglund, Benjamin J. Lawrie, and Sokrates T. Pantelides

Abstract

Asymmetric nanophotonic structures enable a wide range of opportunities in optical nanotechnology because they support efficient optical nonlinearities mediated by multiple plasmon resonances over a broad spectral range. The Archimedean nanospiral is a canonical example of a chiral plasmonic structure because it supports even-order nonlinearities that are not generally accessible in locally symmetric geometries. However, the complex spiral response makes nanoscale experimental characterization of the plasmonic near-field structure highly desirable. Here we employ high-efficiency, high-spatial-resolution cathodoluminescence imaging in a scanning transmission electron microscope to describe the spatial, spectral, and polarization response of plasmon modes in the nanospiral geometry.

© 2018 Optical Society of America

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