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Issue 18, 2013
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Metal nanoparticle plasmons operating within a quantum lifetime

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We investigate the dynamics of a plasmonic oscillation over a metal nanoparticle when it is strongly coupled to a quantum emitter (e.g. quantum dot, molecule). We simulate the density matrix evolution for a simple model, a coupled classical–quantum oscillators system. We show that the lifetime of the plasmonic oscillations can be increased several orders of magnitude, up to the decay time of the quantum emitter. This effect shows itself as the narrowing of the plasmon emission band in the spaser (surface plasmon amplification by the stimulated emission of radiation) experiment [Nature, 2009, 460, 1110], where a gold nanoparticle interacts with the surrounding molecules. Enhancement of the plasmonic excitation lifetime enables stimulated emission to overcome the spontaneous one. The enhancement occurs due to the emergence of a phenomenon analogous to electromagnetically induced transparency (EIT). The effect can find applications in many areas of nanoscale physics, such as in quantum information with plasmons and in increasing solar cell efficiency.

Graphical abstract: Metal nanoparticle plasmons operating within a quantum lifetime

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Article information

03 May 2013
25 Jun 2013
First published
26 Jun 2013

Nanoscale, 2013,5, 8616-8624
Article type

Metal nanoparticle plasmons operating within a quantum lifetime

M. E. Taşgın, Nanoscale, 2013, 5, 8616
DOI: 10.1039/C3NR02270F

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