SKM 2023 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 48: Ultra-fast Phenomena
HL 48.4: Vortrag
Freitag, 31. März 2023, 10:15–10:30, POT 251
Ultrafast optical control of polariton energy in an organic semiconductor microcavity — •K.E. McGhee1,2, M. Guizzardi3, R. Jayaprakash1, K. Georgiou1,4, G. Cerullo3,5, T. Jessewitsch6, A. Zasedatelev7, U. Scherf6, T. Virgili5, P.G. Lagoudakis7, and D.G. Lidzey1 — 1University of Sheffield, UK — 2Universität Leipzig, Germany — 3Politecnico di Milano, Italy — 4University of Cyprus, Cyprus — 5Istituto di Fotonica e Nanotecnologia-CNR, Italy — 6Universität Wuppertal, Germany — 7University of Southampton, UK
Exciton-polariton condensates are of great interest due to their potential applications in polariton logic devices, nonlinear photonic integrated circuits and quantum simulators. In this work, we have fabricated polariton microcavities designed to allow the dynamic trapping and manipulation of such condensates using ultrashort laser pulses. Using transient pump-probe spectroscopy, we have saturated the electronic transition of a weakly-coupled dye in a cavity containing a second strongly-coupled dye. In doing so, we alter the cavity effective refractive index and therefore the position of the lower polariton branch. We demonstrate a maximum blueshift of this mode of 12 meV, dependent on the pump fluence, and show that this effect is ultrafast, with switch ‘on’ and ‘off’ times of less than 1 ps. Utilising this controllable energy shift, it should be possible to dynamically ‘write’ energy barriers into organic polariton microcavities without affecting the coupling strength. This would allow important studies on interacting polariton condensates for the development of next generation quantum devices.