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HL: Fachverband Halbleiterphysik

HL 85: Poster Session II

HL 85.53: Poster

Donnerstag, 17. März 2011, 18:00–21:00, P4

Cascading enables ultrafast gain recovery dynamics of quantum dot semiconductor optical amplifiers — •Niels Majer, Kathy Lüdge, and Eckehard Schöll — Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin

Optoelectronic devices based on semiconductor quantum dots are promising candidates for future high speed telecom applications with low operation currents, high temperature stability, low chirp and ultrafast gain recovery dynamics and hence pattern effect free amplification at high bit rates. In this work [1] the ultrafast gain recovery dynamics of a quantum dot semiconductor optical amplifier is investigated on the basis of semiconductor Bloch equations including microscopically calculated carrier-carrier scattering rates between the 2D carrier reservoir and the confined quantum dot ground and first excited state. By analyzing the different scattering contributions we show that the cascading process makes a major contribution to the ultrafast recovery dynamics.

[1] N. Majer, K. Lüdge, and E. Schöll, Phys. Rev. B 82 (2010), in print.