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HL: Fachverband Halbleiterphysik

HL 48: Poster 2

HL 48.21: Poster

Thursday, March 26, 2009, 15:00–17:30, P2

Tailoring the Emission Properties and the Axial Light Confinement in Microtube Resonators — •Christian Strelow, Kay Dietrich, Christoph Schultz, Hagen Rehberg, Christian Heyn, Detlef Heitmann, and Tobias Kipp — Institut für Angewandte Physik und Zentrum

Microtube resonators are optical cylindrical microresonators which are formed by rolled-up strained InGaAs/GaAs bilayers [1]. We demonstrate that these structures are microresonators whose properties can be tailored very precisely. The growth by molecular beam epitaxy allows to integrate diverse optical internal emitters like quantum wells or self-assembled InAs quantum dots. Another very interesting possibility is that due to the strong evanescent fields of the very thin walls also external emitters like chemically synthesized nanoparticles can be coupled to the resonator modes. Samples with different semiconductor compositions and thus strain field and bandstructure have been tailored to control the emission properties and the confinement of the light for the particular emitters are compared. We present several mechanisms of axial light confinement experimentally and prove these by spatially and energetically resolved photoluminescence measurements. We acknowledge financial support by the Deutsche Forschungsgemeinschaft via SFB 508 "Quantum Materials" and GK 1286 "Functional Metal-Semiconductor Hybrid Systems".

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