Room Temperature Weak-to-Strong Coupling and the Emergence of Collective Emission from Quantum Dots Coupled to Plasmonic Arrays

Ravindra Kumar Yadav, Marc R. Bourgeois, Charles Cherqui, Xitlali G. Juarez, Weijia Wang, Teri W. Odom, George C. Schatz, Jaydeep Kumar Basu

Research output: Contribution to journalArticlepeer-review

Abstract

Colloidal quantum dot (CQD) assemblies exhibit interesting optoelectronic properties when coupled to optical resonators ranging from Purcell-enhanced emission to the emergence of hybrid electronic and photonic polariton states in the weak and strong coupling limits, respectively. Here, experiments exploring the weak-to-strong coupling transition in CQD-plasmonic lattice hybrid devices at room temperature are presented for varying CQD concentrations. To interpret these results, generalized retarded Fano-Anderson and effective medium models are developed. Individual CQDs are found to interact locally with the lattice yielding Purcell-enhanced emission. At high CQD densities, polariton states emerge as two-peak structures in the photoluminescence, with a third polariton peak, due to collective CQD emission, appearing at still higher CQD concentrations. Our results demonstrate that CQD-lattice plasmon devices represent a highly flexible platform for the manipulation of collective spontaneous emission using lattice plasmons, which could find applications in optoelectronics, ultrafast optical switches, and quantum information science.

Original languageEnglish
Pages (from-to)7347-7357
Number of pages11
JournalACS nano
Volume14
Issue number6
DOIs
Publication statusPublished - Jun 23 2020

Keywords

  • Purcell factor
  • lattice plasmons
  • polariton
  • quantum dot
  • strong coupling
  • surface lattice resonances

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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