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Title: Spatially and spectrally resolved orbital angular momentum interactions in plasmonic vortex generators

Journal Article · · Light, Science & Applications

Understanding the near-field electromagnetic interactions that produce optical orbital angular momentum (OAM) is crucial for integrating twisted light into nanotechnology. Here, we examine the cathodoluminescence (CL) of plasmonic vortices carrying OAM generated in spiral nanostructures. The nanospiral geometry defines a photonic local density of states that is sampled by the electron probe in a scanning transmission electron microscope (STEM), thus accessing the optical response of the plasmonic vortex with high spatial and spectral resolution. We map the full spectral dispersion of the plasmonic vortex in spiral structures designed to yield increasing topological charge. Additionally, we fabricate nested nanospirals and demonstrate that OAM from one nanospiral can be coupled to the nested nanospiral, resulting in enhanced luminescence in concentric spirals of like handedness with respect to concentric spirals of opposite handedness. The results illustrate the potential for generating and coupling plasmonic vortices in chiral nanostructures for sensitive detection and manipulation of optical OAM.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Vanderbilt Univ., Nashville, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
FG02-09ER46554; FG02-01ER45916; AC05-00OR22725
OSTI ID:
1619545
Alternate ID(s):
OSTI ID: 1505338; OSTI ID: 1597928
Journal Information:
Light, Science & Applications, Journal Name: Light, Science & Applications Vol. 8 Journal Issue: 1; ISSN 2047-7538
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United Kingdom
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

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Figures / Tables (5)