Abstract
We discuss the coupling between optically excited semiconductor nanocrystals (NC) and thin metal films in both the single and multi-exciton regime. Using time-resolved photoluminescence spectroscopy, we determine the decay dynamics of free space and surface plasmon polariton (SPP) coupled emission. The two dynamics are found to be distinctly different at very small NC-metal separations and at photon energies close to the SPP resonance frequency. A comparison with numerical calculations allow us to conclude that the difference in emission dynamics is associated with the different interactions of parallel and perpendicular dipole emitters with lossy surface waves. Experiments at high excitation densities reveal that the coupling to SPPs and lossy surface waves is identical for excitons and biexcitons.
Highlights
Coupling between dipole emitters and metal nanostructures at optical frequencies allows control over the flow of electromagnetic energy on the nano- and micrometer length scale [1,2,3,4,5,6,7,8,9,10]
surface plasmon coupled emission (SPPE) has been characterized previously, only few reports addressed the dynamic of the coupling between emitters and surface plasmon polariton (SPP) and how it compares with time-resolved free space emission (FSE) [9,10,14]
In this work we have studied the interaction of dipole emitters with thin metal films by comparing the decay dynamics of free space and SPP coupled emission
Summary
Coupling between dipole emitters and metal nanostructures at optical frequencies allows control over the flow of electromagnetic energy on the nano- and micrometer length scale [1,2,3,4,5,6,7,8,9,10] Such coupling has been used to demonstrate enhanced emission and absorption of emitters [1,2,3,4], plasmon lasers [5,6], and the successful implementation of electrically pumped surface plasmon polariton (SPP) emitters [7]. SPPE has been characterized previously, only few reports addressed the dynamic of the coupling between emitters and SPPs and how it compares with time-resolved free space emission (FSE) [9,10,14] All these investigations were performed in the low excitation power or linear regime and in the discussion of the SPP dynamics the orientation of the dipole emitter with respect to the metal structure was not considered. Using high-intensity excitation pulses we determine the biexciton-metal coupling and compare it with the coupling between single excitons and metal films
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