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Vibrationally assisted polariton-relaxation processes in strongly coupled organic-semiconductor microcavities

Coles, David M.; Michetti, Paolo; Clark, Caspar; Tsoi, Wing Chung; Adawi, Ali M.; Kim, Ji Seon; Lidzey, David G.


David M. Coles

Paolo Michetti

Caspar Clark

Wing Chung Tsoi

Ji Seon Kim

David G. Lidzey


If a semiconductor with an electronic transition that approximates a two-level system is placed within an optical cavity, strong coupling can occur between the confined photons and the semiconductor excitons. This coupling can result in the formation of cavity polariton states that are a coherent superposition of light and matter. If the material in the cavity is an organic semiconductor, it has been predicted that interactions between Frenkel excitons, polaritons, and molecular vibrational modes will have a profound role in defining the overall relaxation dynamics of the system. Here, using temperature-dependent spectroscopy on a microcavity containing a J-aggregated cyanine dye, it is shown that a spectrum of localized vibrational modes (identified by Raman scattering) enhances the population of certain polaritonic modes by acting as an energy-loss channel to the excitons as they undergo scattering. Our work demonstrates that simultaneous control of the optical properties of a cavity and the vibrational structure of a molecular dye could promote the efficient population of k = 0 polariton states, from which lasing and other cooperative phenomena may occur.


Coles, D. M., Michetti, P., Clark, C., Tsoi, W. C., Adawi, A. M., Kim, J. S., & Lidzey, D. G. (2011). Vibrationally assisted polariton-relaxation processes in strongly coupled organic-semiconductor microcavities. Advanced Functional Materials, 21(19), 3691-3696.

Journal Article Type Article
Acceptance Date Apr 5, 2011
Online Publication Date Jul 4, 2011
Publication Date Oct 7, 2011
Deposit Date Nov 13, 2014
Journal Advanced Functional Materials
Print ISSN 1616-301X
Electronic ISSN 1616-3028
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 21
Issue 19
Pages 3691-3696
Keywords Electrochemistry; Electronic, Optical and Magnetic Materials; Condensed Matter Physics; Biomaterials
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