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Thermal management of blue GaN-based nanoporous VCSELs

Gevers, Clémentine
(2022)

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Gevers_38721700_2022.pdf
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Details

Supervisors
Francis, Laurent ; Han, Jung
Faculty
Ecole polytechnique de Louvain
Degree label
Master [120] : ingénieur civil électricien, à finalité spécialisée
Abstract
In this work a model on Comsol Multiphysics®, from Comsol Inc. has been presented to model the heat transport in nanoporous blue GaN-based VCSELs. Today, more than 100 million VCSELs are produced annually. However blue GaN VCSELs are still challenging because of the bottom mirror that shows high thermal conductivity or low electrical conductivity or demanding epitaxial processes. Nanoporous distributed Bragg mirrors are analysed and modeled to improve the thermal resistance of the mirror. This kind of mirror is very promising since it is electrically conductivity and the fabrication of this DBR is not as challenging as other mirrors (epitaxial or dielectric). Lowering the temperature in the VCSEL is the key element to reach continuous wave operation since the heating in the device is the main limitation. By lowering the temperature in the device, the performance of the VCSELs are expected to be increased. The main temperature-dependent parameters that are analysed are the thermal wavelength shift and the decrease of the differential quantum efficiency.