14 April 2006 Spin-controlled vertical cavity surface-emitting lasers
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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.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Stephan Hövel, Stephan Hövel, Nils C. Gerhardt, Nils C. Gerhardt, Carsten Brenner, Carsten Brenner, Martin R. Hofmann, Martin R. Hofmann, Fang-Yuh Lo, Fang-Yuh Lo, Dirk Reuter, Dirk Reuter, Andreas D. Wieck, Andreas D. Wieck, Ellen Schuster, Ellen Schuster, Werner Keune, Werner Keune, } "Spin-controlled vertical cavity surface-emitting lasers", Proc. SPIE 6184, Semiconductor Lasers and Laser Dynamics II, 61840Y (14 April 2006); doi: 10.1117/12.662411; https://doi.org/10.1117/12.662411

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