Multi-faceted plasmonic nanocavities

Kalun Bedingfield, Eoin Elliott, Arsenios Gisdakis, Nuttawut Kongsuwan, Jeremy Baumberg, Angela Demetriadou*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

Plasmonic nanocavities form very robust sub-nanometer gaps between nanometallic structures and confine light within deep subwavelength volumes to enable unprecedented control of light–matter interactions. However, spherical nanoparticles acquire various polyhedral shapes during their synthesis, which has a significant impact in controlling many light–matter interactions, such as photocatalytic reactions. Here, we focus on nanoparticle-on-mirror nanocavities built from three polyhedral nanoparticles (cuboctahedron, rhombicuboctahedron, decahedron) that commonly occur during the synthesis. Their photonic modes have a very intricate and rich optical behaviour, both in the near- and far-field. Through a recombination technique, we obtain the total far-field produced by a molecule placed within these nanocavities, to reveal how energy couples in and out of the system. This work paves the way towards understanding and controlling light–matter interactions, such as photocatalytic reactions and non-linear vibrational pumping, in such extreme environments.
Original languageEnglish
Pages (from-to)3931-3944
Number of pages14
JournalNanophotonics
Volume12
Issue number20
DOIs
Publication statusPublished - 4 Oct 2023

Keywords

  • facet
  • quasi-normal modes
  • crystallization facet
  • nanocavity
  • nanoparticle
  • nanogap

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