Regensburg 2013 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 60: Focus Session: Coherent dynamics in semiconductor nanostructures and coupled devices

HL 60.1: Topical Talk

Mittwoch, 13. März 2013, 15:00–15:30, H16

Direct observation of coherent light matter interaction in room temperature semiconductor devices — •Gadi Eisenstein — EE Dept. Tedhnion, Haifa Israel

Direct observations of coherent light matter interactions requires that the electronic wave function dephases at a rate slower than the time of the measurement. In room temperature semiconductors, the dephasing time is 1-2 ps and therefore, experiments are traditionally performed at cryogenic temperatures so as to vastly increase the dephasing time.

An alternative approach is to shorten the observation time to well below the 1-2 ps dephasing time but this requires a special characterization capability. A very good approach is to use FROG or X-FROG systems in which the complete complex electric field of a pulse after propagating through a nonlinear medium can be determined with high precision.

We will describe such experiments in which X-FROG was used to demonstrate Rabi oscillations and self induced transparency in a room temperature electrically driven laser amplifier. The X-FROG system has a temporal resolution of about 1 fs and is highly sensitive. The experiments are accompanied by a comprehensive model based on solving the Maxwell - Schrodinger equations using an FDTD code. The simulations confirm all the experimental observations.