Berlin 2008 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 39: Ultra fast phenomena

HL 39.3: Vortrag

Donnerstag, 28. Februar 2008, 11:45–12:00, ER 270

Picosecond acoustic pulse altering the emission dynamics of a semiconductor planar microcavity — •Thorsten Berstermann¹, Dmitri R. Yakovlev^1,2, Manfred Bayer¹, Alexey V. Scherbakov², Andrey V. Akimov², Jacqueline Bloch³, and Isabelle Sagnes³ — ¹Experimentelle Physik 2, Technische Universität Dortmund, D-44227 Dortmund, Deutschland — ²A.F. Ioffe Physico-Technical Institute, 194021 St. Petersburg, Russia 2 — ³Laboratoire de Photonique et de Nanostructures, LPN/CNRS, Route de Nozay, 91460 Marcoussis , France

In the present work we report the first experiments where the propagating strain wave packets, which contain GHz frequency components, effect the intensity and the wavelength of the photoluminescence in a semiconductor microcavity strongly coupled to the exciton resonance in a quantum well. The studied microcavity was grown on GaAs substrate and contains a 8nm wide In_0.04Ga_0.96As/GaAs quantum well in a λ-cavity, surrounded by Bragg mirrors built up from 20 and 24 pairs of GaAs/AlAs layers. The strain pulses are induced via 100fs short laser pulses obtained from a pulsed laser with a regenerative optical amplifier. The strain amplitude is ∼10⁻⁴, yielding a shift of the exciton resonance in the quantum well of ∼1 meV [1]. This results in the detuning of the coupled microcavity and exciton resonances causing the modulation of the photoluminescence intensity and its wavelength on a picosecond time scale. The observed effects inroduce new methods for ultrafast control of the emission from optical microcavities and photonic crystals. [1] Akimov et al. PRL 97, 037401 (2006)