Electrostatic Mechanism of Emission Enhancement in Hybrid Metal-semiconductor Light-emitting Heterostructures Page: I
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Llopis, Antonio. Electrostatic mechanism of emission enhancement in hybrid
metal-semiconductor light-emitting heterostructures. Doctor of Philosophy (Physics),
May 2012, 96 pp., 5 tables, 34 illustrations, references, 72 titles.
Ill-V nitrides have been put to use in a variety of applications including laser
diodes for modern DVD devices and for solid-state white lighting. Plasmonics has come
to the foreground over the past decade as a means for increasing the internal quantum
efficiency (IQE) of devices through resonant interaction with surface plasmons which
exist at metal/dielectric interfaces. Increases in emission intensity of an order of
magnitude have been previously reported using silver thin-films on InGaN/GaN MQWs.
The dependence on resonant interaction between the plasmons and the light emitter
limits the applications of plasmonics for light emission.
This dissertation presents a new non-resonant mechanism based on electrostatic
interaction of carriers with induced image charges in a nearby metallic nanoparticle.
Enhancement similar in strength to that of plasmonics is observed, without the
restrictions imposed upon resonant interactions. In this work we demonstrate several
key features of this new interaction, including intensity-dependent saturation, increase in
the radiative recombination lifetime, and strongly inhomogeneous light emission. We
also present a model for the interaction based on the aforementioned image charge
interactions. Also discussed are results of work done in the course of this research
resulting in the development of a novel technique for strain measurement in light-
emitting structures. This technique makes use of a spectral fitting model to extract
information about electron-phonon interactions in the sample which can then be related
to strain using theoretical modeling.
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Llopis, Antonio. Electrostatic Mechanism of Emission Enhancement in Hybrid Metal-semiconductor Light-emitting Heterostructures, dissertation, May 2012; Denton, Texas. (digital.library.unt.edu/ark:/67531/metadc115113/m1/2/: accessed April 26, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .