Light Management in Optoelectronic Devices with Disordered and Chaotic Structures
With experimental realization, energy harvesting capabilities of chaotic microstructures were explored. Incident photons falling into chaotic trajectories resulted in energy buildup for certain frequencies. As a consequence, many fold enhancement in light trapping was observed. These ellipsoid like...
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| Language: | en |
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2012
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| Online Access: | Khan, Y. (2012). Light Management in Optoelectronic Devices with Disordered and Chaotic Structures. KAUST Research Repository. https://doi.org/10.25781/KAUST-XL2DM http://hdl.handle.net/10754/235351 |
| Summary: | With experimental realization, energy harvesting capabilities of chaotic microstructures
were explored. Incident photons falling into chaotic trajectories resulted in energy buildup
for certain frequencies. As a consequence, many fold enhancement in light trapping was
observed. These ellipsoid like chaotic microstructures demonstrated 25% enhancement
in light trapping at 450nm excitation and 15% enhancement at 550nm excitation. Optimization
of these structures can drive novel chaos-assisted energy harvesting systems. In
subsequent sections of the thesis, prospect of broadband light extraction from white light
emitting diodes were investigated, which is an unchallenged but quintessential problem in
solid-state lighting. Size dependent scattering allows microstructures to interact strongly
with narrow-band light. If disorder is introduced in spread and sizes of microstructures,
broadband light extraction is possible. A novel scheme with Voronoi tessellation to quantify
disorder in physical systems was also introduced, and a link between voronoi disorder
and state disorder of statistical mechanics was established. Overall, in this thesis some
nascent concepts regarding disorder and chaos were investigated to efficiently manage
electromagnetic waves in optoelectronic devices. |
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