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J Microsc. 2001 Apr;202(Pt 1):229-40.

Femtosecond near-field spectroscopy: carrier relaxation and transport in single quantum wires.

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Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, D-2489 Berlin, Germany.


Quasi-two-colour femtosecond pump and probe spectroscopy and near-field scanning optical microscopy are combined to study the carrier dynamics in single semiconductor nanostructures. In temporally, spectrally and spatially resolved measurements with a time resolution of 200 fs and a spatial resolution of 200 nm, the non-linear change in reflectivity of a single quantum wire is mapped in real space and time. The experiments show that carrier relaxation into a single quantum wire occurs on a 100 fs time scale at room temperature. Evidence is given for a transient unipolar electron transport along the wire axis on a picosecond time and 100 nm length scale.

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