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

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 nanoparticle (NP). We highlight that generating hot electrons in plasmonic NPs contribute 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 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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Supplementary files

Publication details

The article was received on 02 Mar 2017, accepted on 31 Mar 2017 and first published on 11 Apr 2017


Article type: Paper
DOI: 10.1039/C7NR01512G
Citation: Nanoscale, 2017, Accepted Manuscript
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    Ultrafast transient optical loss dynamics in exciton-plasmon nano-assemblies

    M. ElKabbash, A. Rahimi Rashed, B. Küçüköz, Q. Nguyen, A. Karatay, G. Yaglioglu, E. Ozbay, H. Caglayan and G. Strangi, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR01512G

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