Theory of directed transportation of electronic excitation between single molecules through photonic coupling

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Andrews, D. L. and Bradshaw, D. S. ORCID: https://orcid.org/0000-0002-6458-432X (2008) Theory of directed transportation of electronic excitation between single molecules through photonic coupling. In: Proceedings of SPIE - The International Society for Optical Engineering. Proceedings of the Society of Photo-Optical Instrumentation Engineers (SPIE), 6999 . UNSPECIFIED, FRA. ISBN 9780819471970

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Abstract

The primary result of UV-Visible photon absorption by complex organic molecules is the population of short-lived electronic excited states. Transportation of their excitation energy between single molecules, formally mediated by near-field interactions, may occur between the initial absorption and eventual fluorescence emission events, commonly on an ultrafast timescale. The routing of energy flow is typically effected by a sequence of pairwise transfer steps over numerous molecules, rather than a single step over the same overall distance. Directionality emerges when there is structure in the molecular organisation. For a chemically heterogeneous system with local order, and with suitable molecular dispositions, automatically unidirectional transfer can be exhibited as the result of a 'spectroscopic gradient'. However it is also possible to exert control over the directionality of excitation flow by the operation of external influences. Examples are the application of an electrical or optical stimulus to the system - achieved by the incorporation of an ancillary polar species, the application of a static electric field or electromagnetic radiation. Most significantly, based on the latter option, an all-optical method has recently been determined that enables excitation transportation to be completely switched on or off, such that the energy flow is subject to controllable photoactivated gating. It is already apparent that this photonic process, termed Optically Controlled Resonance Energy Transfer, has potentially numerous applications. For example, it represents a new basis for optical transistor action.

Item Type: Book Section
Faculty \ School: Faculty of Science > School of Chemistry
UEA Research Groups: Faculty of Science > Research Groups > Physical and Analytical Chemistry (former - to 2017)
Faculty of Science > Research Groups > Chemistry of Light and Energy
Faculty of Science > Research Groups > Centre for Photonics and Quantum Science
Related URLs:
Depositing User: Rachel Smith
Date Deposited: 02 Nov 2010 16:57
Last Modified: 09 Feb 2023 13:30
URI: https://ueaeprints.uea.ac.uk/id/eprint/10670
DOI: 10.1117/12.780573

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