Dresden 2017 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 63: Poster: Quantum Dots and Optics

HL 63.49: Poster

Wednesday, March 22, 2017, 15:00–19:00, P1A

Resonantly excited quantum dots embedded in GaAs rib waveguides — •Jonas Binz, Thomas Herzog, Mario Schwartz, Ulrich Rengstl, Matthias Paul, Simone Portalupi, Michael Jetter, and Peter Michler — Institut für Halbleiteroptik und Funktionelle Grenzflächen, Allmandring 3, D-70569 Stuttgart

One of the major goals to realize linear optic quantum computation circuits is the fully on-chip integration of single-photon sources, single-photon detectors and waveguide (WG) structures. The circuit itself needs bended WG structures for building elements like a beamsplitter. However the bend radius cannot be chosen arbitrary small since the losses are increasing. In our approach, we investigate InGaAs quantum dots (QDs) embedded in GaAs/AlGaAs single-mode WG structures with varying curvature radii. By improving our design from a cosine shaped WG to a round shaped one, we could reduce the curvature radius to 10 µm from previously 20.6 µm while maintaining losses of 2.8 dB/mm.

For experiments on the single-photon level, the laser background under resonant excitation has to be as low as possible. Our measurements via pulsed resonant excitation with the polarization parallel to the WG allow us to efficiently excite a QD having almost no unwanted laser background contribution (∼ 1%). This results in observation of Rabi-oscillations with more than two periods of QD emission as a function of the laser excitation power.