Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 12: HL Poster I

HL 12.54: Poster

Montag, 1. April 2019, 17:30–20:00, Poster E

OAM spectroscopy of fractional exciton polariton vortices — •Bernd Berger, Marius Kahlert, Daniel Schmidt, and Marc Aßmann — Experimentelle Physik 2, Technische Universität Dortmund, 44227 Dortmund, Germany

Vortices are elementary excitations of exciton polariton condensates that receive significant attention. Their characteristic feature is a helical phase gradient l· 2π which translates into the orbital angular momentum (OAM) state of the emitted light field. We demonstrate a spectroscopic method which utilizes the technique of OAM sorting to transform the helical phase gradient of OAM states to a linear phase gradient. This enables the detection of the topological charge of exciton polartion vortices without an interferometric setup. We demonstrate that this method is not limited to integer topological charges, but also works for arbitrary fractional OAM states with phase rotations different from multiples of 2π, which is comparatively hard to do using interferometric techniques. In summary the method we present opens new ways in researching vortices in exciton polaritons especially tailored towards non-integer OAM states. We discuss the possibility of exciting fractional vortices in exciton polariton condensates and probing the time dynamics of complex polariton processes such as vortex decays or vortex switching.