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New Frontiers in Organic Polariton Devices: Fluorescent Molecules, Polariton Lasers, and Biological Systems

Grant, Richard Theodore (2016) New Frontiers in Organic Polariton Devices: Fluorescent Molecules, Polariton Lasers, and Biological Systems. PhD thesis, University of Sheffield.

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Abstract

This thesis concerns the manufacture and study of strongly-coupled microcavities containing a series of different organic and biological semiconductors. It contains a simple fitting model developed to describe changes to polariton population distribution observed in microcavities containing a fluorescent molecular dye. Changes are described in terms of direct radiative pumping of polariton states by weakly-coupled states coexisting within the cavity. It also describes the careful selection and characterisation of a series of molecular dyes to evaluate their likelihood of first entering the strong coupling regime and secondly producing coherent emission. The construction of a polariton laser containing one of these dyes is shown. Finally by placing a component of light-harvesting complexes (chlorosomes) harvested from bacteria within a planar microcavity, this work details the first demonstration of strong-coupling in a biological system. Further efforts to modify energy transfer in biological systems (carotenoids) by entering the strong coupling regime are discussed in detail.

Item Type: Thesis (PhD)
Keywords: Polariton Exciton Strong Coupling Laser Organic Semiconductor Small Molecule Polymer Chlorosome Biological Microcavity
Academic Units: The University of Sheffield > Faculty of Science (Sheffield)
The University of Sheffield > Faculty of Science (Sheffield) > Physics and Astronomy (Sheffield)
Identification Number/EthosID: uk.bl.ethos.707109
Depositing User: Mr Richard Theodore Grant
Date Deposited: 31 Mar 2017 13:30
Last Modified: 12 Oct 2018 09:37
URI: http://etheses.whiterose.ac.uk/id/eprint/16819

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