Laser-controlled fluorescence in two-level systems

Leeder, J.M., Bradshaw, D.S. and Andrews, D.L. (2011) Laser-controlled fluorescence in two-level systems. The Journal of Physical Chemistry B, 115 (18). pp. 5227-5233. ISSN 1520-6106

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Abstract

The ability to modify the character of fluorescent emission by a laser-controlled, optically nonlinear process has recently been shown theoretically feasible, and several possible applications have already been identified. In operation, a pulse of off-resonant probe laser beam, of sufficient intensity, is applied to a system exhibiting fluorescence, during the interval of excited- state decay following the initial excitation. The result is a rate of decay that can be controllably modified, the associated changes in fluorescence behavior affording new, chemically specific information. In this paper, a two-level emission model is employed in the further analysis of this all-optical process; the results should prove especially relevant to the analysis and imaging of physical systems employing fluorescent markers, these ranging from quantum dots to green fluorescence protein. Expressions are presented for the laser-controlled fluorescence anisotropy exhibited by samples in which the fluorophores are randomly oriented. It is also shown that, in systems with suitably configured electronic levels and symmetry properties, fluorescence emission can be produced from energy levels that would normally decay nonradiatively. © 2010 American Chemical Society.

Item Type: Article
Faculty \ School: Faculty of Science > School of Chemistry
Related URLs:
Depositing User: Users 2731 not found.
Date Deposited: 23 Aug 2011 11:41
Last Modified: 17 Sep 2020 23:29
URI: https://ueaeprints.uea.ac.uk/id/eprint/34585
DOI: 10.1021/jp108142j

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