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Impact of photoinduced processes on the plasmonic enhancement of colloidal quantum dot emission

Published online by Cambridge University Press:  10 April 2013

S. M. Sadeghi ,
R. G. West  and
Kira D. Patty
S. M. Sadeghi
Affiliation:
Department of Physics, University of Alabama in Huntsville, Huntsville, AL 35899, USA Nano and Micro Device Center, University of Alabama in Huntsville, AL 35899, USA
R. G. West
Affiliation:
Department of Physics, University of Alabama in Huntsville, Huntsville, AL 35899, USA
Kira D. Patty
Affiliation:
Department of Physics, University of Alabama in Huntsville, Huntsville, AL 35899, USA
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Abstract

We study the mutual effects of photoinduced processes (irradiation effects) and plasmonic emission enhancement in close-packed CdSe/ZnS colloidal quantum dots in the vicinity of gold metallic nanoparticles with two significantly different size distributions. For this we examine the impact of the heat generated by the metallic nanoparticles, the strength of plasmonic field enhancement, and the rate of energy transfer from the quantum dots to metallic nanoparticles in the presence of a laser field with low and moderate intensities. Our results show that the interplay between the photophysics of the quantum dots and their plasmonic emission enhancement is significantly pronounced when the metallic nanoparticles are large. In such a case we observed large suppression of photoinduced fluorescence enhancement (PFE). For smaller metallic nanoparticles the results suggest mostly an overall time-independent suppression of the quantum dots’ emission with no significant impact on PFE.

Keywords

nanostructurephotochemicalphotoemission
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1509: Symposium CC – Optically Active Nanostructures , 2013 , mrsf12-1509-cc03-19
Copyright
Copyright © Materials Research Society 2013

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References

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