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

Thorsten Ackemann, M. Y. Li, H. Jaehme, H. Soldat, N.C. Gerhardt, M. R. Hofmann

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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.
Original languageEnglish
Title of host publicationVertical-Cavity Surface-Emitting Lasers XV
EditorsJ. K. Guenter, Chun Lei
Pages79520B
Number of pages8
Volume7952
DOIs
Publication statusPublished - 7 Feb 2011

Publication series

NameProc. SPIE
PublisherSPIE

Keywords

  • polarization oscillations
  • laser devices

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