Controlling nanoscale optical emission with off-resonant laser light

Andrews, D.L., Leeder, J.M. and Bradshaw, D.S. (2010) Controlling nanoscale optical emission with off-resonant laser light. In: Proceedings of SPIE - The International Society for Optical Engineering. UNSPECIFIED. ISBN 9780819481856

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Abstract

In the optical excitation of many nanoscale systems, the primary result of photon absorption is an electronic excitation that is typically followed by ultrafast relaxation processes. The losses associated with such relaxation generally produce a partial degradation of the optical energy acquired, before any ensuing photon emission occurs. Recent work has shown that the intensity and directional character of such emission may be significantly influenced through engagement with a completely off-resonant probe laser beam of sufficient intensity: the mechanism for this optical coupling is a secondorder nonlinearity. It is anticipated that the facility to actively control fluorescent emission in this way may lead to new opportunities in a variety of applications where molecular chromophores or quantum dots are used. In the latter connection it should prove possible to exploit the particle size dependence of the nonlinear optical dispersion, as well as that of the emission wavelength. Specific characteristics of the effect are calculated, and suitable experimental implementations of the mechanism are proposed. We anticipate that this all-optical control device may introduce significant new perspectives to fluorescence imaging techniques and other analytical applications.

Item Type: Book Section
Uncontrolled Keywords: lasers,nanotechnology,photons,quantum dots,particles,luminescence,absorption,dispersion
Faculty \ School: Faculty of Science > School of Chemistry
Related URLs:
Depositing User: Pure Connector
Date Deposited: 12 May 2014 15:06
Last Modified: 22 Jul 2020 03:18
URI: https://ueaeprints.uea.ac.uk/id/eprint/48233
DOI: 10.1117/12.854555

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