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Master of Science (M.S.)

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I will present a new ultrafast time-resolved photoluminescence technique using two-photon absorption detection (TPAD). In this femtosecond photoluminescence (PL) experiment the PL dynamics are monitored by focusing the PL signal and an ultrafast gate pulse on a GaN photodiode with nonlinear properties. Specifically, after sample excitation with a femtosecond excitation pulse the emitted photons from the sample and the gate pulse couple together to create electron hole pairs with the combined photon energy (two-photon absorption) in the high bandgap photodiode. The bandgap of the photodiode is large enough that linear absorption of the PL or the gate pulse is negligible. Techniques with a time resolution in the femtosecond range provide insight into dynamic processes including charge and energy relaxation, recombination and transfer. Following the discussion of the TPAD experiments I will give an overview of already existing time-resolved PL techniques which will allow to compare the performance of the presented technique with these techniques.


First Advisor

Marc Achermann