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HL: Halbleiterphysik

HL 36: Optical properties

HL 36.6: Vortrag

Mittwoch, 29. März 2006, 17:30–17:45, POT 151

Semiconductor microtubes acting as optical ring resonators — •T. Kipp, H. Welsch, Ch. Strelow, Ch. Heyn, and D. Heitmann — Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg

We demonstrate optical modes in InGaAs/GaAs microtubes acting as an optical ring resonator. Self-supporting microtubes with a diameter of about 5 µm and a wall thickness of about 200 nm were fabricated by optical lithography and wet-etching processes utilizing the self-rolling mechanism of strained bilayers. The optical modes were probed by the photoluminescence of InAs quantum dots embedded in the tube’s wall. In this novel microtube ring resonator we find a spectrum of sharp modes. They are in very good agreement with the theoretical results for a closed thin dielectric waveguide. Financial support is acknowledged by the Deutsche Forschungsgemeinschaft via the SFB 508.