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Optica Publishing Group
  • Quantum Electronics and Laser Science Conference
  • OSA Technical Digest (Optica Publishing Group, 1996),
  • paper QMF2

Femtosecond near-field spin microscopy to digital magnetic heterostructures

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Abstract

A femtosecond-resolved low-temperature near-field scanning optical microscope (NSOM) is used to monitor the spatiotemporal evolution of excifonic spins in magnetic semiconductor quantum structures that are laterally patterned with a focused beam of Ga+ ions.1,2 Polarization-resolved photoluminescence (PL) images reveal a spin-dependent energy landscape in which the Zeeman splitting is diminished in implanted regions, and carrier and spin behavior is directly distinguished by sharp differences in intensity and polarization profits. Time-resolved measurements suggest that exciton diffusion acquires a spin-dependent component in the presence of a magnetic field. The data demonstrate fundamental limitations on the measurement of polarized PL from semiconductors in the nearfield regime.

© 1996 Optical Society of America

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