Ultrafast control of strong light-matter coupling
Open Access
- 21 January 2018
- journal article
- research article
- Published by IOP Publishing in New Journal of Physics
- Vol. 20 (1), 013032
- https://doi.org/10.1088/1367-2630/aa9fd0
Abstract
We dynamically modulate strong light-matter coupling in a GaAs/AlGaAs microcavity using intense ultrashort laser pulses tuned below the interband exciton energy, which induce a transient Stark shift of the cavity polaritons. For 225-fs pulses, shorter than the cavity Rabi cycle period of 1000 fs, this shift decouples excitons and cavity photons for the duration of the pulse, interrupting the periodic energy exchange between photonic and electronic states. For 1500-fs pulses, longer than the Rabi cycle period, however, the Stark shift does not affect the strong coupling. The two regimes are marked by distinctly different line shapes in ultrafast reflectivity measurements-regardless of the Stark field intensity. The crossover marks the transition from adiabatic to diabatic switching of strong lightmatter coupling.Funding Information
- National Science Foundation (DMR-0819860, DMR-1104383, PHY-1205762)
- Gordon and Betty Moore Foundation
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