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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 11 — May. 28, 2007
  • pp: 7083–7094

Highly efficient fluorescence of a fluorescing nanoparticle with a silver shell

Xue-Wen Chen, Wallace C. H. Choy, Sailing He, and P. C. Chui  »View Author Affiliations

Optics Express, Vol. 15, Issue 11, pp. 7083-7094 (2007)

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Spontaneous emission (SE) rate and the fluorescence efficiency of a bare fluorescing nanoparticle and the nanoparticle with a silver nanoshell are analyzed rigorously by using a classical electromagnetic approach with the consideration of the nonlocal effect of the silver nano-shell. The dependences of the SE rate and the fluorescence efficiency on the core-shell structure are carefully studied and the physical interpretations of the results are addressed. The results show that the SE rate of a bare nanoparticle is much slower than that in the infinite medium by almost an order of magnitude and consequently the fluorescence efficiency is usually low. However, by encapsulating the nanoparticle with a silver shell, highly efficient fluorescence can be achieved as a result of a large Purcell enhancement and high out-coupling efficiency for a well-designed core-shell structure. We also show that a higher SE rate may not offer a larger fluorescence efficiency since the fluorescence efficiency not only depends on the internal quantum yield but also the out-coupling efficiency.

© 2007 Optical Society of America

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(260.2110) Physical optics : Electromagnetic optics
(300.6280) Spectroscopy : Spectroscopy, fluorescence and luminescence

ToC Category:
Optics at Surfaces

Original Manuscript: May 11, 2007
Revised Manuscript: May 18, 2007
Manuscript Accepted: May 18, 2007
Published: May 24, 2007

Xue-Wen Chen, Wallace C. Choy, Sailing He, and P. C. Chui, "Highly efficient fluorescence of a fluorescing nanoparticle with a silver shell," Opt. Express 15, 7083-7094 (2007)

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