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

Yadav, RK and Bourgeois, MR and Cherqui, C and Juarez, XG and Wang, W and Odom, TW and Schatz, GC and Basu, JK (2020) Room Temperature Weak-to-Strong Coupling and the Emergence of Collective Emission from Quantum Dots Coupled to Plasmonic Arrays. In: ACS Nano, 14 (6). pp. 7347-7357.

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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.

Item Type:	Journal Article
Publication:	ACS Nano
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to American Chemical Society.
Keywords:	Nanocrystals; Optical switches; Phonons; Photons; Plasmonics; Quantum optics; Semiconductor quantum dots, Colloidal quantum dots; Effective medium model; Enhanced Emission; Flexible platforms; Optoelectronic properties; Plasmonic arrays; Quantum information science; Ultra-fast optical switches, Optical lattices
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	06 Feb 2023 06:50
Last Modified:	06 Feb 2023 06:50
URI:	https://eprints.iisc.ac.in/id/eprint/79867

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