Journal
NANOSCALE
Volume 9, Issue 19, Pages 6558-6566Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7nr01512g
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Funding
- Ohio Third Frontier Project Research Cluster on Surfaces in Advanced Materials (RC-SAM) at Case Western Reserve University
- Project DPT-HAMIT
- Project NATO-SET-193
- Turkish Academy of Sciences
- Science Academy of Turkey through the BAGEP programme
- Turkish Academy of Sciences through the GEBIP programme
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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.
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