Interaction of surface plasmons with CdTe quantum dot excitons

K. K. Vamsi; Yu. P. Rakovich; A. L. Bradley; J. F. Donegan; B. Doggett; T. Donnelly; J. G. Lunney; N. Gaponik; A. Susha

doi:10.1117/12.622601

27 September 2005 Interaction of surface plasmons with CdTe quantum dot excitons

K. K. Vamsi, Yu. P. Rakovich, A. L. Bradley, J. F. Donegan, B. Doggett, T. Donnelly, J. G. Lunney, N. Gaponik, A. Susha

Proceedings Volume 5955, Metamaterials; 59550L (2005) https://doi.org/10.1117/12.622601
Event: Congress on Optics and Optoelectronics, 2005, Warsaw, Poland

Abstract

A 5-fold enhancement in the luminescence of CdTe nanocrystal quantum dots (QDs) is observed when they are placed in proximity to a nanostructured Au film deposited by pulsed laser deposition technique. No enhancement is observed with a nanostructured Ag film. The enhancement is due to the interaction of the QDs excitons with the localized surface plasmons (LSP). The Au surface plasmon (SP) frequency is closer to the QDs emission frequency than Ag LSP frequency and this accounts for the differences in observed behavior. As the SP-QD interaction strongly depends on the geometric structure and shape of the metal nanoparticles, a comparison with QDs deposited on a film of Au colloidal nanoparticles is presented. In the case of QDs placed directly on the Au colloids the luminescence quenching is much stronger and with a spacer layer a 3.5-fold enhancement over the bare QDs luminescence is observed.

Citation Download Citation

K. K. Vamsi, Yu. P. Rakovich, A. L. Bradley, J. F. Donegan, B. Doggett, T. Donnelly, J. G. Lunney, N. Gaponik, and A. Susha "Interaction of surface plasmons with CdTe quantum dot excitons", Proc. SPIE 5955, Metamaterials, 59550L (27 September 2005); https://doi.org/10.1117/12.622601

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