Dresden 2009 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 13: Optical properties

HL 13.10: Vortrag

Dienstag, 24. März 2009, 12:00–12:15, BEY 118

Optical Microtube Bottle Resonators — •Christian Strelow, Christoph M. Schultz, Hagen Rehberg, Christian Heyn, Detlef Heitmann, and Tobias Kipp — Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg

Using the self-rolling mechanism of strained InGaAs/GaAs bilayers freestanding microtube bridges can be fabricated acting as optical ring resonators [1]. Here, we report on the realization of novel microtube resonators with a bottlelike geometry [2]. Spatially and energetically resolved photoluminescence (PL) measurements show that the PL light of self-assembled InAs quantum dots embedded in the tube wall is confined similar to charged particles in a magnetic bottle. The measured eigenenergies and the measured axial field distributions resemble the eigenenergies and the probability densities of particles in a one dimensional potential. This can be described by a straight and intuitive model using an adiabatic separation of the circulating and the axial propagation. The dispersion of the axial mode energies follows a photonic quasi-Schrödinger equation including a quasipotential. We demonstrate that the quasipotential and, consequently, the dispersion of the axial modeenergies can be tailored precisely by simple adjustments of the microtube geometry. We acknowledge financial support by the Deutsche Forschungsgemeinschaft via SFB 508 "Quantum Materials" and GK 1286 "Functional Metal-Semiconductor Hybrid Systems".

[1] T. Kipp et al., Phys. Rev. Lett. 96, 077403 (2006)

[2] Ch. Strelow et al., Phys. Rev. Lett. 101, 127403 (2008)