Berlin 2018 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 52: Optical properties & Photonic crystals
HL 52.6: Vortrag
Freitag, 16. März 2018, 10:45–11:00, EW 201
Routing of exciton-polaritons in microcavity waveguides — •Johannes Beierlein1, Sebastian Klembt1, Martin Klaas1, Monika Emmerling1, Holger Suchomel1, Karol Winkler1, Sebastian Brodbeck1, Hugo Flayac2, Christian Schneider1, and Sven Höfling1,3 — 1Technische Physik, Universität Würzburg, Germany — 2Institute of Theoretical Physics, EPFL, CH-1015 Lausanne, Switzerland — 3School of Physics and Astronomy, University of St. Andrews, KY 16 9SS, United Kingdom
Exciton-polaritons have been in the centre of scientific investigation due to their hybrid light-matter nature. It allows for large propagation distances while maintaining a strong non-linearity. This work sheds light on the functionality of two passive exciton-polariton routing devices. First, two microcavity waveguides (WGs), which are realized by etching the top and bottom DBRs, are evanescently coupled. Due to the evanescent coupling, a Josephson oscillation manifests itself. This oscillation is clearly displayed in real-space due to the propagating nature of the condensate. Depending on the device parameters a different phase at the end of the coupling area can be achieved, resulting in different routing ratios. Further, we discuss two WGs which are coupled by a microcavity disc. A propagating condensate along one WG can be transmitted into the disc where it circulates and eventually exits into the other wire. Both of those tunneling events are energy dependent. The size parameters of the disc as well as the WGs influences the energy transmission pattern and therefore allows for energy controlled reshaping of the condensate.