Dresden 2020 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 61: Focus Session: Tailored Nonlinear Photonics I
HL 61.8: Talk
Thursday, March 19, 2020, 12:30–12:45, POT 51
All-optical switching of exciton polariton vortices — Xuekai Ma1, •Bernd Berger2, Marc Assmann2, Rodislav Driben1, Torsten Meier1, Christian Schneider3, Sven Höfling3,4, and Stefan Schumacher1,5 — 1Department of Physics and Center for Optoelectronics and Photonics Paderborn (CeOPP), Universität Paderborn, Warburger Strasse 100, 33098 Paderborn, Germany — 2Experimentelle Physik 2, Technische Universität Dortmund, 44227 Dortmund, Germany — 3Technische Physik, Universität Würzburg, Am Hubland, 97074, Würzburg, Germany — 4SUPA, School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, United Kingdom — 5College of Optical Sciences, University of Arizona, Tucson, AZ 85721, USA
Vortices are elementary excitations in exciton polariton condensates that consist of a 2π·m radial phase shift of the polariton wavefunction, where m is the topological charge of the vortex. This topological charge translates into the orbital angular momentum (OAM) state of the emitted light field, which we detect by application of a dedicated OAM spectroscopy technique. This technique gives us the opportunity to study the temporal dynamics of vortices in exciton polariton condensates without using complex interferometric techniques that also always require a phase reference. Here, we theoretically and experimentally demonstrate the switching of the charge of a localized vortex in a microcavity polariton condensate.