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Beyond the hybridization effects in plasmonic nanoclusters: diffraction-induced enhanced absorption and scattering.

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      Abstract

      It is demonstrated herein both theoretically and experimentally that Young's interference can be observed in plasmonic structures when two or three nanoparticles with separation on the order of the wavelength are illuminated simultaneously by a plane wave. This effect leads to the formation of intermediate-field hybridized modes with a character distinct of those mediated by near-field and/or far-field radiative effects. The physical mechanism for the enhancement of absorption and scattering of light due to plasmonic Young's interference is revealed, which we explain through a redistribution of the Poynting vector field and the formation of near-field subwavelength optical vortices.

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      Affiliations
      [1 ] Data Storage Institute, A*STAR (Agency for Science Technology and Research), DSI Building, 5 Engineering Drive 1, 117608, Singapore; Department of Physics, Imperial College London, London, SW7 2AZ, United Kingdom; Department of Electrical and Computer Engineering, National University of Singapore, 117576, Singapore.
      Journal
      Small
      Small (Weinheim an der Bergstrasse, Germany)
      1613-6829
      1613-6810
      Feb 12 2014
      : 10
      : 3
      24000095
      10.1002/smll.201301419
      © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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