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Hot Electron Generation and Cathodoluminescence Nanoscopy of Chiral Split Ring Resonators

Yuri Fang (Institutionen för fysik, Bionanofotonik (Chalmers)) ; Ruggero Verre (Institutionen för fysik, Bionanofotonik (Chalmers)) ; Lei Shao (Institutionen för fysik, Bionanofotonik (Chalmers)) ; Peter Nordiander ; Mikael Käll (Institutionen för fysik, Bionanofotonik (Chalmers))
Nano Letters (1530-6984). Vol. 16 (2016), 8, p. 5183-5190.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: Chiral nanostructures, hot electron generation, surface plasmons, dichroic-sensitive, energy-loss spectroscopy, plasmonic nanostructures, colloidal, lithography, metal nanostructures, nanometer-scale, light, extinction, nanowires, antenna, growth, Chemistry, Science & Technology - Other Topics, Materials Science, Physics



Denna post skapades 2016-09-16.
CPL Pubid: 241891

 

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