Stuttgart 2012 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 47: SYPC 3: From Atoms to Photonic Circuits 3
A 47.6: Vortrag
Freitag, 16. März 2012, 11:45–12:00, V47.02
Influence of the excitation pulse width on the purity of single-photon emission from light emitting diodes — •Fabian Hargart1, Christian Kessler1, Matthias Reischle1, Wolfgang-Michael Schulz1, Marcus Eichfelder1, Robert Rossbach1, Michael Jetter1, Paul Gartner2, Matthias Florian2, Christopher Gies2, Frank Jahnke2, and Peter Michler1 — 1Institut für Halbleiteroptik und Funktionelle Grenzflächen, Universität Stuttgart, Allmandring 3, 70569 Stuttgart — 2Institut für Theoretische Physik, Universität Bremen, Postfach 330 440, 28334 Bremen
For many applications in quantum information single-photons on demand are desirable. Electrically driven semiconductor quantum dots (QDs) are a promising solution due to their tailorable emission energy and the integration in well-known semiconductor devices.
Pulsed lasers afford an almost instantaneous excitation of the QDs compared to their decay time. In contrast, electrical pulse generators feature pulsewidths only down to several 10 ps. Therefore we determine the influence of the excitation pulses on the purity of single-photon emission from InP/GaInP quantum dots. For rising widths we observe an increasing g(2)(0) - value, which we relate to an increasing probability of further excitations during one single cycle. Using autocorrelation measurements with high temporal resolution we can distinguish the background contribution from re-excitation processes on the non-vanishing g(2)(0)-value. Theoretical investigations are in a good agreement with the experimental results.