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Proceedings Paper

Nanoscale plasmonic resonators with high Purcell factor: spontaneous and stimulated emission
Author(s): Ewa M. Goldys; Wei Deng; Nils P. Calander; K. Drozdowicz-Tomsia; Dayong Jin
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Paper Abstract

Plasmonic nanoparticles with silver cores and silica shells containing Eu fluorophores near the surface have been produced by wet chemistry method and their spontaneous emission properties characterized. Fluorescence amplification and decreased lifetime is interpreted within the Purcell framework which highlights the role of surface plasmon polariton modes of the nanoparticle. These behave as energy-storing resonators, with values of the Q factor between 50 and 170 at the fluorophore wavelength of 615 nm, and very small mode volumes, in the order of 104 nm3, producing high Purcell factors of over 4000. Comparison of experiment with theoretical calculations by using the Mie theory shows that the values of cavity Q factors are moderated by the nonradiative rate of fluorophore molecules close to metal. The criteria for laser action in such composite nanoparticles are also presented, including lasing frequencies and threshold gain.

Paper Details

Date Published: 11 February 2011
PDF: 13 pages
Proc. SPIE 7909, Colloidal Quantum Dots/Nanocrystals for Biomedical Applications VI, 79090H (11 February 2011); doi: 10.1117/12.881170
Show Author Affiliations
Ewa M. Goldys, Macquarie Univ. (Australia)
Wei Deng, Macquarie Univ. (Australia)
Nils P. Calander, Macquarie Univ. (Australia)
K. Drozdowicz-Tomsia, Macquarie Univ. (Australia)
Dayong Jin, Macquarie Univ. (Australia)

Published in SPIE Proceedings Vol. 7909:
Colloidal Quantum Dots/Nanocrystals for Biomedical Applications VI
Wolfgang J. Parak; Kenji Yamamoto; Marek Osinski, Editor(s)

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