Regensburg 2007 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 28: Optical properties

HL 28.1: Talk

Wednesday, March 28, 2007, 14:15–14:30, H14

Localized Optical Modes in Microtube Resonators containing InGaAs Quantum Wells — •Christian Strelow, Hagen Rehberg, Christoph Matthias Schultz, Holger Welsch, Christian Heyn, Detlef Heitmann, and Tobias Kipp — Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg

We report on optical modes in semiconductor microtube resonators containing InGaAs quantum wells. Self-supporting microtubes were fabricated by optical lithography and wet etching processes utilizing the self-rolling mechanism of a strained InAlGaAs/AlGaAs bilayer. On the low energy side of the quantum well emission we observe a signal of sharp modes (Q ∼ 2000) which is about 10 times stronger than the background. Modes on the high energy side show much smaller Q-factors (Q ∼ 280) caused by reabsorption of light. The modes are localized due to a confinement along the axis of the tube. We study the spatial intensity distributions. A theoretical model considering the tube as a rolled-up waveguide yields mode energies, which agree very well to the experimental results.

We acknowledge financial support from the Deutsche Forschungsgesellschaft via SFB 508 and the Graduiertenkolleg 1286.