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Proceedings Paper

Spin induced gigahertz polarization oscillations in vertical-cavity surface-emitting laser devices
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Paper Abstract

Spin-controlled vertical-cavity surface-emitting lasers (VCSELs) have been intensively studied in recent years because of the low threshold feasibility and the nonlinearity above threshold, which make spin-VCSELs very promising for spintronic devices. Here we investigate the circular polarization dynamics of VCSELs on a picosecond time scale after pulsed optical spin injection at room temperature. A hybrid excitation technique combining continuous-wave (cw) unpolarized electrical excitation slightly above threshold and pulsed polarized optical excitation is applied. The experimental results demonstrate ultrafast circular polarization oscillations with a frequency of about 11 GHz. The oscillations last inside the first undulation of the intensity relaxation oscillations. Via theoretical calculations based on a rate equation model we analyze these oscillations as well as the underlying physical mechanisms.

Paper Details

Date Published: 8 February 2011
PDF: 7 pages
Proc. SPIE 7952, Vertical-Cavity Surface-Emitting Lasers XV, 79520B (8 February 2011); doi: 10.1117/12.873758
Show Author Affiliations
M. Y. Li, Ruhr-Univ. Bochum (Germany)
H. Jaehme, Ruhr-Univ. Bochum (Germany)
H. Soldat, Ruhr-Univ. Bochum (Germany)
N. C. Gerhardt, Ruhr-Univ. Bochum (Germany)
M. R. Hofmann, Ruhr-Univ. Bochum (Germany)
T. Ackemann, Univ. of Strathclyde (United Kingdom)


Published in SPIE Proceedings Vol. 7952:
Vertical-Cavity Surface-Emitting Lasers XV
James K. Guenter; Chun Lei, Editor(s)

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