Fabrication of Surface Metal Nanoparticles and Their Induced Surface Plasmon Coupling with Subsurface Quantum Wells
Date Issued
2011
Date
2011
Author(s)
Huang, Che-Wei
Abstract
The fabrications of Au and Ag nanoparticles (NPs) with controlled geometry and surface density on a GaN epitaxial structure containing InGaN/GaN quantum wells (QWs) based on polystyrene nanosphere (NS) lithography and the characterizations of their localized surface plasmon (LSP) coupling behaviors with the QWs are demonstrated. By using an appropriate polystyrene NS size and adjusting the post-fabrication thermal annealing condition, the induced LSP resonance wavelength of the fabricated Ag NPs on GaN can roughly match with the QW emission wavelength for generating coherent coupling between the radiating dipoles in the QWs and the induced LSP. The coupling leads to the enhancement of radiative recombination rate of free carriers in the QWs and results in increased photoluminescence (PL) intensity, PL red shift, and PL decay time reduction. Temperature-dependent PL measurement also shows the increase of QW emission internal quantum efficiency through the coupling mechanism.
Subjects
InGaN
Metal nanoparticle
Localized Surface Plasmon
Polystyrene nanosphere
Photoluminescence
Type
thesis
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