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Weak superradiance in arrays of plasmonic nanoantennas

Research output: Contribution to journalArticle

Author(s)

Saumya Choudhary, Israel De Leon, Sylvia Swiecicki, Kashif Masud Awan, Sebastian Andreas Schulz, Jeremy Upham, M. Zahirul Alam, Robert W. Boyd

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Abstract

A collection of N emitters can exhibit an N-fold broadening of the radiative linewidth resulting from the development of a macroscopic dipole moment. Such a broadening of the radiative linewidth has previously been observed in systems of several nanoparticles and has often been described in terms of superradiant behavior. However, the understanding of the physics behind the observed dependence of radiative linewidth on the number of irradiated nanoparticles is far from complete. In this paper, we present theoretical and experimental results that elucidate this broadening mechanism in plasmonic systems and draw a connection with the phenomenon of Dicke superradiance. We demonstrate that, in the limit where radiative broadening dominates, the extinction linewidth of a planar array of plasmonic nanoantennas scales linearly with the number of nanoantennas contained within a circle of radius equal to the resonant optical wavelength. We explain this classical phenomenon as a weak superradiance effect, which corresponds to the case in the Dicke model where only the ground state and the first collective excited state contribute to the enhanced radiation.
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Details

Original languageEnglish
Article number043814
Pages (from-to)1-9
Number of pages9
JournalPhysical Review. A, Atomic, molecular, and optical physics
Volume100
Issue number4
Early online date11 Oct 2019
DOIs
Publication statusPublished - Oct 2019

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