We have designed a low-temperature femtosecond-resolved near-field scanning optical microscope to study spatiotemporal excitonic spin behavior in magnetic semiconductor heterostructures. Local disorder introduced by focused-ion-beam implantation reduces the otherwise large Zeeman splittings in modest magnetic fields, creating a planar spin-dependent energy landscape for diffusing carriers. Near-field polarization-resolved static and femtosecond measurements map out excitonic spin behavior with ∼125 nm spatial resolution, revealing spin-dependent diffusion. We demonstrate the applicability of two distinct time-resolved techniques in the near field, and discuss limitations on the measurement of polarized luminescence from semiconductors in the near field.
|Original language||English (US)|
|Number of pages||6|
|Journal||Journal of Applied Physics|
|Issue number||8 PART 2B|
|State||Published - Apr 15 1996|
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)