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Proceedings Paper

Spin-controlled vertical cavity surface-emitting lasers
Author(s): Stephan Hövel; Nils C. Gerhardt; Carsten Brenner; Martin R. Hofmann; Fang-Yuh Lo; Dirk Reuter; Andreas D. Wieck; Ellen Schuster; Werner Keune
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Paper Abstract

The output polarization of an optically pumped InGaAs/GaAs vertical cavity surface-emitting laser (VCSEL) is analyzed at room temperature as a function of the circular input polarization degree. The emission of the VCSEL is unambiguously controlled by the exciting polarization and only 30% of spin-polarized electrons are needed in the active region to generate an output polarization degree of up to 100% at short-pulsed pumping. This testifies that a VCSEL can be used as an effective amplifier for spin information even at room temperature. Measurements with a continuous wave excitation were executed to demonstrate the possibility of spin-amplification by electrical spin-injection in a VCSEL. All measurements were confirmed by a phenomenological spin flip model. Our paper is completed with the introduction of Fe/Tb-Multilayers used for spin injection. These contacts enable spin injection without external magnetic fields, i.e. in remanence. Finally, we suggest a combination of these multilayers with a VCSEL-structure to create the first spin-optoelectronic device working both at room temperature and without external fields.

Paper Details

Date Published: 14 April 2006
PDF: 14 pages
Proc. SPIE 6184, Semiconductor Lasers and Laser Dynamics II, 61840Y (14 April 2006); doi: 10.1117/12.662411
Show Author Affiliations
Stephan Hövel, Ruhr-Univ. Bochum (Germany)
Nils C. Gerhardt, Ruhr-Univ. Bochum (Germany)
Carsten Brenner, Ruhr-Univ. Bochum (Germany)
Martin R. Hofmann, Ruhr-Univ. Bochum (Germany)
Fang-Yuh Lo, Ruhr-Univ. Bochum (Germany)
Dirk Reuter, Ruhr-Univ. Bochum (Germany)
Andreas D. Wieck, Ruhr-Univ. Bochum (Germany)
Ellen Schuster, Duisburg-Essen Univ. (Germany)
Werner Keune, Duisburg-Essen Univ. (Germany)

Published in SPIE Proceedings Vol. 6184:
Semiconductor Lasers and Laser Dynamics II
Daan Lenstra; Markus Pessa; Ian H. White, Editor(s)

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