Dresden 2009 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 43: Photonic crystals I

HL 43.7: Talk

Thursday, March 26, 2009, 11:15–11:30, POT 151

Influence of (Geometrical) Micropillar Properties on the Cavity Quality Factor — •Matthias Karl¹, Benjamin Kettner², Sven Burger², Frank Schmidt², Heinz Kalt¹, and Michael Hetterich¹ — ¹Institut für Angewandte Physik and DFG Center for Functional Nanostructures (CFN), Universität Karlsruhe (TH), 76128 Karlsruhe, Germany — ²Zuse Institut Berlin (ZIB), 14195 Berlin, Germany

We present numerical studies of optical cavity modes in Bragg micropillars based on a finite element method (FEM). The modes are either obtained by solving an eigenvalue or a scattering problem. Good agreement to experimental data is demonstrated and various influences on the quality (Q) factor of the fundamental pillar mode are investigated.

On the one hand we determine absolute maximum Q factors which depend on the absorption of the semiconductor cavity material. On the other hand geometrical parameters are varied in detail to calculate their influence: Pillar diameter and sidewall inclination show critical features with respect to the Q factor. Furthermore, the top and bottom Bragg stacks are modified in the number of pairs and the etching depth.