Few-emitter lasing in single ultra-small nanocavities

Oluwafemi S. Ojambati, Kristín B. Arnardóttir, Brendon W. Lovett, Jonathan Keeling, Jeremy J. Baumberg*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)
11 Downloads (Pure)


Lasers are ubiquitous for information storage, processing, communications, sensing, biological research and medical applications. To decrease their energy and materials usage, a key quest is to miniaturise lasers down to nanocavities. Obtaining the smallest mode volumes demands plasmonic nanocavities, but for these, gain comes from only a single or few emitters. Until now, lasing in such devices was unobtainable due to low gain and high cavity losses. Here, we demonstrate a form of 'few emitter lasing' in a plasmonic nanocavity approaching the single-molecule emitter regime. The few-emitter lasing transition significantly broadens, and depends on the number of molecules and their individual locations. We show this non-standard few-emitter lasing can be understood by developing a theoretical approach extending previous weak-coupling theories. Our work paves the way for developing nanolaser applications as well as fundamental studies at the limit of few emitters.

Original languageEnglish
Pages (from-to)2679-2686
Number of pages8
Issue number14
Early online date19 Jan 2024
Publication statusPublished - Jun 2024
Externally publishedYes


  • emitter
  • nanocavity
  • nanolaser
  • nonlinear light emission
  • plasmonic nanocavity


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