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Strong coupling of carbon quantum dots in plasmonic nanocavities

Version 2 2024-06-06, 03:27
Version 1 2020-04-21, 10:35
journal contribution
posted on 2024-06-06, 03:27 authored by JM Katzen, C Tserkezis, Q Cai, LH Li, JM Kim, G Lee, GR Yi, WR Hendren, EJG Santos, RM Bowman, F Huang
Copyright © 2020 American Chemical Society. Confining light in extremely small cavities is crucial in nanophotonics, central to many applications. Employing a unique nanoparticle-on-mirror plasmonic structure and using a graphene film as a spacer, we create nanoscale cavities with volumes of only a few tens of cubic nanometers. The ultracompact cavity produces extremely strong optical near-fields, which facilitate the formation of single carbon quantum dots in the cavity and simultaneously empower the strong coupling between the excitons of the formed carbon quantum dot and the localized surface plasmons. This is manifested in the optical scattering spectra, showing a magnificent Rabi splitting of up to 200 meV under ambient conditions. In addition, we demonstrate that the strong coupling is tuneable with light irradiation. This opens new paradigms for investigating the fundamental light emission properties of carbon quantum dots in the quantum regime and paves the way for many significant applications.

History

Journal

ACS Applied Materials and Interfaces

Volume

12

Pagination

19866-19873

Location

Washington, D.C.

ISSN

1944-8244

eISSN

1944-8252

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Issue

17

Publisher

American Chemical Society

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