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2 September 2009 Coupling dynamics between photoluminescent centers in ZnO and surface plasmons
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Nanostructured metal-ZnO systems provide an ideal workbench for studying the dynamics of exciton-plasmon coupling. In order to characterize the interactions, we grew tri-layer structures comprising thin films of ZnO, variable-thickness spacer layers of MgO, and thin films of Ag or Au. Analysis of the photoluminescence of these structures as a function of increasing MgO thickness confirms the existence of surface plasmon polariton-exciton coupling through Purcell enhancement of the excitonic emission for MgO films thinner than 30 nm, and through emission at the SPP resonance for MgO films thicker than 30 nm. Further, we demonstrate the enhancement of the ZnO impurity photoluminescence through dipole-dipole scattering with Ag and Au LSPs. Preliminary degenerate band-edge pump-probe measurements confirm the conclusions developed from photoluminescence measurements. In order to disentangle and further quantify the interactions seen in these systems, we are lithographically patterning metal nanoparticle arrays and metal hole arrays on ZnO quantum wells and beginning to perform white-light pump-probe spectroscopy to fully characterize the dynamics of energy transfer within these systems.
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B. J. Lawrie, R. Mu, and R. F. Haglund "Coupling dynamics between photoluminescent centers in ZnO and surface plasmons", Proc. SPIE 7394, Plasmonics: Metallic Nanostructures and Their Optical Properties VII, 73941V (2 September 2009);

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