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5 March 2021 Controlling the emission time of photon echoes by optical freezing of exciton dephasing and rephasing in quantum-dot ensembles
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Abstract
Following the ultrafast optical excitation of an inhomogeneously broadened ensemble, the macroscopic optical polarization decays rapidly due to dephasing. This destructive interference is, however, reversible in photon echo experiments. Here, we propose a concept in which a control pulse slows down either the dephasing or the rephasing of the exciton ensemble during its presence. We analyze and visualize this optical freezing process by showing and discussing results for different single and multiple sequences of control pulses using a simple model of inhomogeneously broadened two-level systems. This idea has been realized in experiments performed on self-assembled (In,Ga)As quantum dots where it was possible to retard or advance the photon echo emission time by several picoseconds. The measurements are in very good agreement with numerical simulations for a more realistic model which, in particular, takes the spatial shape of the laser pulses into account.
Conference Presentation
© (2021) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Matthias Reichelt, Hendrik Rose, Alexander N. Kosarev, Sergey V. Poltavtsev, Manfred Bayer, Ilya A. Akimov, Christian Schneider, Martin Kamp, Sven Höfling, and Torsten Meier "Controlling the emission time of photon echoes by optical freezing of exciton dephasing and rephasing in quantum-dot ensembles", Proc. SPIE 11684, Ultrafast Phenomena and Nanophotonics XXV, 116840X (5 March 2021); https://doi.org/10.1117/12.2576887
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