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Proceedings Paper

Controlling nanoscale optical emission with off-resonant laser light
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Paper 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.

Paper Details

Date Published: 11 May 2010
PDF: 8 pages
Proc. SPIE 7712, Nanophotonics III, 77121R (11 May 2010); doi: 10.1117/12.854555
Show Author Affiliations
David L. Andrews, Univ. of East Anglia Norwich (United Kingdom)
Jamie M. Leeder, Univ. of East Anglia Norwich (United Kingdom)
David S. Bradshaw, Univ. of East Anglia Norwich (United Kingdom)


Published in SPIE Proceedings Vol. 7712:
Nanophotonics III
David L. Andrews; Jean-Michel Nunzi; Andreas Ostendorf, Editor(s)

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