title: Strong Exciton-Photon Coupling with Colloidal Nanoplatelets in an Open Microcavity.
abstract: Colloidal semiconductor nanoplatelets exhibit quantum size effects due to their thickness of only a few monolayers, together with strong optical band-edge transitions facilitated by large lateral extensions. In this article, we demonstrate room temperature strong coupling of the light and heavy hole exciton transitions of CdSe nanoplatelets with the photonic modes of an open planar microcavity. Vacuum Rabi splittings of 66 ± 1 meV and 58 ± 1 meV are observed for the heavy and light hole excitons, respectively, together with a polariton-mediated hybridization of both transitions. By measuring the concentration of platelets in the film, we compute the transition dipole moment of a nanoplatelet exciton to be μ = (575 ± 110) D. The large oscillator strength and fluorescence quantum yield of semiconductor nanoplatelets provide a perspective toward novel photonic devices by combining polaritonic and spinoptronic effects.
authors.affiliation: Department of Materials, University of Oxford , Oxford OX1 3PH, United Kingdom.
authors.forename: Lucas C
authors.initials: LC
authors.lastname: Flatten
authors.affiliation: Nanochemistry Department, Istituto Italiano di Tecnologia , Via Morego 30, IT-16163 Genova, Italy.|Department of Physics, University of Genoa , Via Dodecaneso 33, IT-16146 Genova, Italy.
authors.forename: Sotirios
authors.initials: S
authors.lastname: Christodoulou
authors.affiliation: Department of Materials, University of Oxford , Oxford OX1 3PH, United Kingdom.
authors.forename: Robin K
authors.initials: RK
authors.lastname: Patel
authors.affiliation: Department of Materials, University of Oxford , Oxford OX1 3PH, United Kingdom.
authors.forename: Alexander
authors.initials: A
authors.lastname: Buccheri
authors.affiliation: Department of Materials, University of Oxford , Oxford OX1 3PH, United Kingdom.
authors.forename: David M
authors.initials: DM
authors.lastname: Coles
authors.affiliation: Department of Physics, Clarendon Laboratory, University of Oxford , Oxford OX1 3PU, United Kingdom.
authors.forename: Benjamin P L
authors.initials: BP
authors.lastname: Reid
authors.affiliation: Department of Physics, Clarendon Laboratory, University of Oxford , Oxford OX1 3PU, United Kingdom.
authors.forename: Robert A
authors.initials: RA
authors.lastname: Taylor
authors.affiliation: Nanochemistry Department, Istituto Italiano di Tecnologia , Via Morego 30, IT-16163 Genova, Italy.
authors.forename: Iwan
authors.initials: I
authors.lastname: Moreels
authors.affiliation: Department of Materials, University of Oxford , Oxford OX1 3PH, United Kingdom.
authors.forename: Jason M
authors.initials: JM
authors.lastname: Smith
keywords: Nanoplatelets; microcavity; polaritons; room-temperature; strong coupling