Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 58: Quantum Dots: Optical Properties IV

HL 58.11: Vortrag

Mittwoch, 22. März 2017, 18:00–18:15, POT 151

Degradation of semiconductor nanowire lasers upon optical pumping — •Maximilian Zapf, Robert Roeder, and Carsten Ronning — Institute of Solid State Physics, Friedrich Schiller University Jena, Max-Wien-Platz 1, 07743 Jena, Germany

Semiconductor nanowires (NWs) are promising candidates for nanoscale coherent light sources in future optoelectronic devices, as they inherently provide the necessary compounds of a laser system such as optical gain and a resonator-like structure. The optical output intensity of a semiconductor NW follows the pump power dependency of a multimode laser system upon moderate optical pumping [Geburt et al., Nanotechnology 23, 365204 (2012)]. However, for extremely high pump powers a material degradation of the laser gain material induces an unambiguous deviation from this dependence. Yet, experiments and future applications require a degradation-free lasing operation in order to retain reliable and durable devices. Thus, we developed a method for identifying the threshold value of any degradation process and its underlying physics. Furthermore, a critical temperature for a NWs' applicability as nano laser can be determined by evaluating the temperature dependence of both the lasing and the degradation threshold.