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      Ultrafast transient optical loss dynamics in exciton-plasmon nano-assemblies

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      Author(s)
      Elkabbash, M.
      Rashed, A.R.
      Kucukoz, B.
      Nguyen, Q.
      Karatay, A.
      Yaglioglu, G.
      Özbay, Ekmel
      Caglayan, H.
      Strangi, G.
      Date
      2017
      Source Title
      Nanoscale
      Print ISSN
      2040-3364
      Publisher
      Royal Society of Chemistry
      Volume
      9
      Issue
      19
      Pages
      6558 - 6566
      Language
      English
      Type
      Article
      Item Usage Stats
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      235
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      Abstract
      We study the exciton-plasmon dynamics that lead to optical loss mitigation via ultrafast transient absorption spectroscopy (UTAS) on hybrid aggregates of core-shell quantum dots (QDs) and Au nanoparticles (NPs). We highlight that generating hot electrons in plasmonic NPs contributes to the transient differential absorption spectrum under optical excitation. The results suggest modifying the method of analyzing the transient absorption spectra of loss mitigated systems. Additionally, we investigate the effect of Electron Oscillation frequency-Phonon Resonance Detuning (EOPRD) on loss mitigation efficiency. Moreover, power dependent UTAS reveal a frequency pulling like effect in the transient bleach maximum towards the gain emission. We show that the appropriate choice of the pump wavelength and by changing the pump power we can conclusively prove the existence of loss mitigation using UTAS. Finally, we study the transient kinetics of hybrid gain-plasmon systems and report interesting hybrid transient kinetics.
      Keywords
      Electromagnetic wave absorption
      Excitons
      Gold
      Hot electrons
      Plasmons
      Semiconductor quantum dots
      Core-shell quantum dots
      Differential absorption
      Electron oscillations
      Hybrid aggregates
      Mitigation efficiency
      Transient absorption spectra
      Transient kinetics
      Ultrafast transient absorption spectroscopy
      Absorption spectroscopy
      Permalink
      http://hdl.handle.net/11693/37238
      Published Version (Please cite this version)
      http://dx.doi.org/10.1039/c7nr01512g
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      • Nanotechnology Research Center (NANOTAM) 1125
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