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      Broadband optical transparency in plasmonic nanocomposite polymer films via exciton-plasmon energy transfer

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      Author(s)
      Dhama R.
      Rashed, A. R.
      Caligiuri V.
      El Kabbash M.
      Strangi, G.
      De Luca A.
      Date
      2016
      Source Title
      Optics Express
      Print ISSN
      10944087
      Publisher
      OSA - The Optical Society
      Volume
      24
      Issue
      13
      Pages
      14632 - 14641
      Language
      English
      Type
      Article
      Item Usage Stats
      130
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      102
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      Abstract
      Inherent absorptive losses affect the performance of all plasmonic devices, limiting their fascinating applications in the visible range. Here, we report on the enhanced optical transparency obtained as a result of the broadband mitigation of optical losses in nanocomposite polymeric films, embedding core-shell quantum dots (CdSe@ZnS QDs) and gold nanoparticles (Au-NPs). Exciton-plasmon coupling enables non-radiative energy transfer processes from QDs to metal NPs, resulting in gain induced transparency of the hybrid flexible systems. Experimental evidences, such as fluorescence quenching and modifications of fluorescence lifetimes confirm the presence of this strong coupling between plexcitonic elements. Measures performed by means of an ultra-fast broadband pump-probe setup demonstrate loss compensation of gold NPs dispersed in plastic network in presence of gain. Furthermore, we compare two films containing different concentrations of gold NPs and same amount of QDs, to investigate the role of acceptor concentration (Au-NPs) in order to promote an effective and efficient energy transfer mechanism. Gain induced transparency in bulk systems represents a promising path towards the realization of loss compensated plasmonic devices. © 2016 Optical Society of America.
      Keywords
      Energy transfer
      Excitons
      Fluorescence
      Gold
      Gold alloys
      Nanocomposite films
      Nanocomposites
      Plasmons
      Quenching
      Semiconductor quantum dots
      Transparency
      Zinc sulfide
      Acceptor concentrations
      Core-shell quantum dots
      Efficient energy transfer
      Experimental evidence
      Fluorescence lifetimes
      Fluorescence quenching
      Nanocomposite polymers
      Nonradiative energy transfer
      Polymer films
      Permalink
      http://hdl.handle.net/11693/36886
      Published Version (Please cite this version)
      http://dx.doi.org/10.1364/OE.24.014632
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