Fluorescence enhancement and strong-coupling in faceted plasmonic nanocavities

Research output: Contribution to journalArticle

Authors

Colleges, School and Institutes

External organisations

  • Cavendish Laboratory, Department of Physics
  • University of Cambridge
  • Nanophotonics Centre
  • Cavendish Laboratory

Abstract

Emission properties of a quantum emitter can be significantly modified inside nanometre-sized gaps between two plasmonic nanostructures. This forms a nanoscopic optical cavity which allows single-molecule detection and single-molecule strong-coupling at room temperature. However, plasmonic resonances of a plasmonic nanocavity are highly sensitive to the exact gap morphology. In this article, we shed light on the effect of gap morphology on the plasmonic resonances of a faceted nanoparticle-on-mirror (NPoM) nanocavity and their interaction with quantum emitters. We find that with increasing facet width the NPoM nanocavity provides weaker field enhancement and thus less coupling strength to a single quantum emitter since the effective mode volume increases with the facet width. However, if multiple emitters are present, a faceted NPoM nanocavity is capable of accommodating a larger number of emitters, and hence the overall coupling strength is larger due to the collective and coherent energy exchange from all the emitters. Our findings pave the way to more efficient designs of nanocavities for room-temperature light-matter strong-coupling, thus providing a big step forward to a non-cryogenic platform for quantum technologies.

Details

Original languageEnglish
Article number6
Number of pages6
JournalEPJ Applied Metamaterials
Volume5
Publication statusPublished - 4 Jun 2018

Keywords

  • Nanoplasmonics, Nanophotonics, Light-matter Strong-coupling, Fluorescence Enhancement, Quenching