Hot Electron Generation and Cathodoluminescence Nanoscopy of Chiral Split Ring Resonators
Journal article, 2016
Three-dimensional chiral plasmonic nanostructures have been shown to be able to dramatically boost photon-spin selective light-matter interactions, potentially leading to novel photonics, molecular spectroscopy, and light-harvesting applications based on circularly polarized light. Here, we show that chiral split-ring gold nanoresonators interfaced to a wide band gap semiconductor exhibit a contrast in hot-electron transfer rate between left-handed and right-handed visible light that essentially mimics the far-field circular dichroism of the structures. We trace down the origin of this effect to the differential excitation of the thinnest part of the split-ring structures using dichroic-sensitive cathodoluminescence imaging with nanometer spatial resolution. The results highlight the intricate interplay between the near-field and far field chiral response of a nanostructure and establishes a clear link to the emerging field of hot carrier plasmonics with numerous potential applications in photocatalysis and solar light harvesting.
metal nanostructures
nanometer-scale
surface plasmons
light
growth
dichroic-sensitive
nanowires
energy-loss spectroscopy
colloidal
Chiral nanostructures
plasmonic nanostructures
lithography
antenna
hot electron generation
extinction
Author
Yurui Fang
Chalmers, Physics, Bionanophotonics
Ruggero Verre
Chalmers, Physics, Bionanophotonics
Lei Shao
Chalmers, Physics, Bionanophotonics
P. Nordlander
Rice University
Mikael Käll
Chalmers, Physics, Bionanophotonics
Nano Letters
1530-6984 (ISSN) 1530-6992 (eISSN)
Vol. 16 8 5183-5190Subject Categories
Atom and Molecular Physics and Optics
Other Physics Topics
Condensed Matter Physics
DOI
10.1021/acs.nanolett.6b02154
PubMed
27464003