Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 94: Poster IV A (Laser; Devices; Heterostructures; Surfaces, interfaces and defects)

HL 94.6: Poster

Thursday, March 19, 2015, 14:00–20:00, Poster B

Quantum dot microlaser under external optical feedback. — •Leon Meßner¹, Elisabeth Schlottmann¹, Sören Kreinberg¹, Steffen Holzinger¹, Christian Schneider², Sven Höfling^2,3, Martin Kamp², Janik Wolters¹, and Stephan Reitzenstein¹ — ¹Institut für Festkörperphysik, Technische Universität Berlin, Berlin, Germany — ²Technische Physik, Wilhelm Conrad Röntgen Research Center for Complex Material Systems, Universität Würzburg, Würzburg, Germany — ³Present address: SUPA, School of Physics and Astronomy, University of St Andrews, United Kingdom.

To study the transition form linear to non-linear and chaotic behavior, semiconductor lasers under self feedback are an excellent and widely investigated model system. Similar, quantum dots embedded in photonic nanocavities provide an excellent platform for investigating the border between classical laser emission and quantum optical single photon emitters. In our experiments on feedback coupled micropillar lasers with only a few quantum dots in the active layer we combine both research fields, trying to reach the transition between the classical and the quantum regime of the involved nonlinear dynamics. We setup strong feedback-coupling of quantum dot micropillars while leaving options to explore changes in feedback strength and polarization. Our observations include changes in the second order autocorrelation function and intensity of the emitted light. Our studies promise not only novel insights into the underlying physics, but depending on emitter and feedback types a multitude of applications exist e.g. in quantum information science or cryptography.