Dresden 2014 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 108: Poster: Ultra-fast phenomena / Optical properties / Semiconductor laser / Devices and device concepts
HL 108.14: Poster
Thursday, April 3, 2014, 17:00–20:00, P1
Controlled lasing from active optomechanical resonators — •Thomas Czerniuk1, Christian Brüggemann1, Jan Tepper1, Sebastian Brodbeck2, Christian Schneider2, Martin Kamp2, Sven Höfling2, Boris Glavin3, Dimitri Yakovlev1,4, Andrey Akimov4, and Manfred Bayer1 — 1Experimentelle Physik 2a, TU Dortmund, Dortmund, Germany — 2Technische Physik, Universität Würzburg, Würzburg, Germany — 3V. E. Lashkaryov Institute of Semiconductor Physics, Kiev, Ukraine — 4A. F. Ioffe Physical-Technical Institute, Russian Academy of Sciences, St. Petersburg, Russia
We report an effective emission intensity modulation of a microcavity laser (VCSEL) with frequencies of up to 40 GHz at room temperature. We investigate a planar microcavity laser, whose active medium are GaAs quantum wells while the DBRs are built out of alternating layers of AlAs/GaAlAs. Due to the acoustic impedance mismatch of these material system, the DBRs possess not only optical, but also acoustic resonances. In a laser with such an optomechanical resonator, the interaction between the three excitations -photons, phonons and excitons- is drastically enhanced, providing control of the emission intensity: by injecting a broadband strain pulse into the cavity, the long living resonant phonon modes are excited. For different delays between strain pulse injection and pulsed optical excitation of the VCSEL, the emission intensity is monitored. The result shows prominent oscillations with frequencies corresponding to the acoustic resonances of the optomechanical device.