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.
| Original language | English |
|---|---|
| Pages (from-to) | 927-930 |
| Number of pages | 4 |
| Journal | Optics Letters |
| Volume | 43 |
| Issue number | 4 |
| DOIs | |
| State | Published - Feb 2018 |
Funding
U.S. Department of Energy (DOE) (DE-FG02-01ER45916, DE-FG02-09ER4655); McMinn Endowment at Vanderbilt. This research was sponsored by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U.S. Department of Energy. Additional support was provided by the U.S. Department of Energy, Office of Science, Office of Workforce Development for Teachers and Scientists (WDTS) under the SULI program. Microscopy experiments were performed at Oak Ridge National Laboratory, sponsored by the Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. The nanospirals were fabricated at the Center for Nanophase Materials Sciences (CNMS), which is sponsored at ORNL by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy.