Dresden 2009 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 9: Poster 1

HL 9.107: Poster

Montag, 23. März 2009, 14:30–17:00, P2

Microscopic model for the Switch-on Dynamics of Quantum-Dot VCSELs — •Jeong Eun Kim, Ermin Malic, Marten Richter, and Andreas Knorr — Institut für Theoretische Physik, Technische Universität Berlin*Hardenbergstr. 36, 10623 Berlin, Germany

Quantum dots (QDs) as active medium in vertical-cavity surface-emitting lasers (VCSELs) promise improved device performance [1]. We present a microscopically motivated calculation of the switch-on dynamics of an electrically pumped QD-VCSEL. The electric field propagation and the dynamics of the QD and WL charge carrier densities are calculated using spatially one-dimensional Maxwell-Bloch equations. For a detailed understanding, microscopically calculated Coulomb scattering processes [2] and a model for spontaneous emission [3] are incorporated into the Maxwell-Bloch equations. The equations are numerically solved by finite-difference time-domain (FDTD) method to investigate the temporal quantum electrodynamics. After the switch-on of the laser on a ns time scale, relaxation oscillations result from an interplay of carrier filling, induced emission, and absorption processes.

[1]	V. M. Ustinov, N. A. Maleev, Phys. Rev. Phys. Rev. A 78,
	022102 (2008)
[2]	E. Malić, M. Bormann, P. Hövel, M. Kuntz, D. Bimberg,
	A. Knorr, and E. Schöll, IEEE J. Select. Topics
	Quantum Electron., 13, 1242 (2007)
[3]	G. M. Slavcheva, J. M. Anold, and R. W. Ziolkowski, IEEE J.
	Select. Topics Quantum Electron. 10, 1052 (2004)