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Weak superradiance in arrays of plasmonic nanoantennas

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PhysRevA.100.043814.pdf (1.252Mb)
Date
10/2019
Author
Choudhary, Saumya
De Leon, Israel
Swiecicki, Sylvia
Awan, Kashif Masud
Schulz, Sebastian Andreas
Upham, Jeremy
Alam, M. Zahirul
Boyd, Robert W.
Keywords
QC Physics
TK Electrical engineering. Electronics Nuclear engineering
NDAS
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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.
Citation
Choudhary , S , De Leon , I , Swiecicki , S , Awan , K M , Schulz , S A , Upham , J , Alam , M Z & Boyd , R W 2019 , ' Weak superradiance in arrays of plasmonic nanoantennas ' , Physical Review. A, Atomic, molecular, and optical physics , vol. 100 , no. 4 , 043814 , pp. 1-9 . https://doi.org/10.1103/PhysRevA.100.043814
Publication
Physical Review. A, Atomic, molecular, and optical physics
Status
Peer reviewed
DOI
https://doi.org/10.1103/PhysRevA.100.043814
ISSN
1050-2947
Type
Journal article
Rights
Copyright © 2019 American Physical Society. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the final published version of the work, which was originally published at https://doi.org/10.1103/PhysRevA.100.043814
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/18796

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