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arXiv:cond-mat/0505587 · Physics Letters A

Local field effects on the radiative lifetime of emitters in surrounding media: Virtual- or real-cavity model?

Chang‐Kui Duan, Michael F. Reid, Zhongqing Wang

Published Jun 23, 2005• 71 citations
arXivHTMLPDF
DOI
10.1016/j.physleta.2005.06.037

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The radiative lifetime of an emitter (such as a luminescent ion) is affected not only by the properties of the emitter itself but also by the dielectric properties of the surrounding media. The fluctuation of the local electrical field caused by random distribution of polarized luminescent-ion-containing nanoparticles in media leads to the fluctuation of radiative lifetime of luminescent ions. Lifetime fluctuation has been calculated analytically by considering this effect. The results show that the fluctuation of radiative lifetime is not negligible and can be shown and observed in future experiments.
We measured the radiative lifetime of Nd:YAG nanopowder with an average particle size of 20nm suspended in different organic and inorganic liquids. To extract information regarding local-field effects, we fitted the experimental data to three different local-field models: the virtual-cavity (or Lorentz) model, the real-cavity model, and the no-local-field-effects model. The real-cavity model and the no-local-field-effects model can both be adequately fitted to our experimental results, while the virtual-cavity model can be ruled out.