Open AccessPolarization- and wavelength-resolved near-field imaging of complex plasmonic modes in Archimedean nanospirals
Author(s) -
Jordan A. Hachtel,
Roderick B. Davidson,
Elena R. Kovalik,
Scott T. Retterer,
Andrew R. Lupini,
Richard F. Haglund,
Benjamin J. Lawrie,
Sokrates T. Pantelides
Publication year - 2018
Publication title -
optics letters/optics index
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.524
H-Index - 272
eISSN - 1071-2763
pISSN - 0146-9592
DOI - 10.1364/ol.43.000927
Subject(s) - plasmon , cathodoluminescence , optics , nanophotonics , polarization (electrochemistry) , near field scanning optical microscope , materials science , surface plasmon , wavelength , optoelectronics , physics , scanning electron microscope , optical microscope , chemistry , luminescence
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.