Ultrafast transient optical loss dynamics in exciton-plasmon nano-assemblies
Author(s)
Date
2017Source Title
Nanoscale
Print ISSN
2040-3364
Publisher
Royal Society of Chemistry
Volume
9
Issue
19
Pages
6558 - 6566
Language
English
Type
ArticleItem Usage Stats
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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 absorptionExcitons
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/11693/37238Published Version (Please cite this version)
http://dx.doi.org/10.1039/c7nr01512gCollections
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