Berlin 2018 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 52: Optical properties & Photonic crystals

HL 52.3: Talk

Friday, March 16, 2018, 10:00–10:15, EW 201

Sorting exciton polariton vortices by their orbital angular momentum — •Bernd Berger¹, Marius Kahlert¹, Daniel Schmidt¹, Marc Aßmann¹, Martin Kamp², Christian Schneider², Sven Höfling², and Manfred Bayer¹ — ¹Experimentelle Physik 2, Technische Universität Dortmund, D-44221 Dortmund, Germany — ²Technische Physik, Physikalisches Institut, Wilhelm Conrad Röntgen Research Center for Complex Material Systems, Universität Würzburg, D-97074 Würzburg, Germany

Vortices are elementary excitations in exciton polariton condensates that consist of a low-density core and a phase rotation of a multiple of 2π around it. In our experiment a light beam carrying orbital angular momentum (OAM) is utilized to excite exciton polariton vortices in a GaAs microcavity at cryogenic temperatures. Thereby the topological charge of the vortex directly corresponds to the quantized OAM of the incident light beam. In a sophisticated approach, the sample signal is sorted by the vortex topological charge and resolved in time without the need of a phase reference. Thus the dynamics of vortices with different topological charges are investigated.