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Conference on Lasers and Electro-Optics

Giant AC Stark Effect in a Strongly-Coupled Light- Matter System

Dmitry Panna, Nadav Landau, Shlomi Bouscher, Leonid Rybak, Shai Tsesses, G. Adler, Sebastian Brodbeck, C. Schneider, Sven Höfling, Alex Hayat

Published Jan 1, 2018• 0 citations
Publisher

Abstract

We present the first experimental observation of a giant non-resonant dynamic Stark effect in strongly coupled microcavity exciton-polaritons – stronger than the Rabi splitting and over an order of magnitude stronger than previous observations.
DOI
10.1364/cleo_qels.2018.fm2f.1

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Summary form only given. The occurrence of Rabi flopping in excitonic transitions of semiconductors demonstrate that an intense light field can induce a non-perturbative ac Stark effect despite the very fast excitation-induced dephasing. However the homogeneous broadening induced by the strong excitation prevented the observation in quantum wells of the spectral counterpart of Rabi oscillations in time, the ac Stark splitting. We report the evolution of the absorption spectrum of a specially designed single InGaAs quantum well as a function of the growing excitation density. The excitation is provided by a pulsed Ti:sapphire laser (100 fs of pulse duration) and the measurements are taken in a pump-probe geometry.
Ultrafast pump-probe measurements evidence the dynamical Stark splitting in the exciton absorption spectrum of a single semiconductor quantum well. The intensity of the Stark sidebands in the spectrum is comparable to the linear absorption and their separation scales as the pump field amplitude. In the time domain the Rabi oscillations are observed. The semiconductor Bloch equations solved in the Hartree-Fock approximation demonstrate that the coherent exciton-light coupling dominates over the many-body dephasing.
We demonstrate ultrafast control of a strongly coupled light–matter system via a giant ac Stark effect in a specially designed strongly coupled microcavity using ultrafast pump–probe spectroscopy. We observe polariton energy shifts larger than the Rabi energy, enabling the implementation of strong noninvasive potentials for robust and ultrafast polaritonic switches. A nonperturbative treatment has been utilized to correctly describe the underlying physics of the giant Stark shifts in our strongly coupled light–matter system and corresponds well to the experimental results. Our findings shed new light on nonperturbative interactions and pave the way for all-optical quantum technologies.