Collective fluorescence enhancement in nanoparticle clusters

Siying Wang, Claudia Querner, Tali Dadosh, Catherine H. Crouch, Dmitry S. Novikov and Marija Drndic ()
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Siying Wang: University of Pennsylvania
Claudia Querner: University of Pennsylvania
Tali Dadosh: University of Pennsylvania
Catherine H. Crouch: Swarthmore College
Dmitry S. Novikov: Center for Biomedical Imaging, New York University School of Medicine, New York 10016, USA. Correspondence and requests for materials should be addressed to M.D. (email: ).
Marija Drndic: University of Pennsylvania

Nature Communications, 2011, vol. 2, issue 1, 1-8

Abstract: Abstract Many nanoscale systems are known to emit light intermittently under continuous illumination. In the fluorescence of single semiconductor nanoparticles, the distributions of bright and dark periods ('on' and 'off' times) follow Lévy statistics. Although fluorescence from single-quantum dots and from macroscopic quantum dot ensembles has been studied, there has been little study of fluorescence from small ensembles. Here we show that blinking nanorods (NRs) interact with each other in a cluster, and the interactions affect the blinking statistics. The on-times in the fluorescence of a NR cluster increase dramatically; in a cluster with N NRs, the maximum on-time increases by a factor of N or more compared with the combined signal from N well-separated NRs. Our study emphasizes the use of statistical properties in identifying the collective dynamics. The scaling of this interaction-induced increase of on-times with number of NRs reveals a novel collective effect at the nanoscale.

Date: 2011
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DOI: 10.1038/ncomms1357

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