Berlin 2012 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 54: Optical Properties
HL 54.5: Talk
Wednesday, March 28, 2012, 12:00–12:15, EW 203
Optical Rolled-Up Microtube Resonators Operating in the Visible Spectral Range — •Christian Strelow1, Andreas Schramm2, Stefanie Kietzmann1, Alf Mews1, and Tobias Kipp1 — 1Institute of Physical Chemistry, University of Hamburg, Germany — 2Optoelectronics Research Centre, Tampere University of Technology, Tampere, Finland
We report on rolled-up optical microtube resonators that operate in the visible spectral range. The microtubes are formed by the self-rolling mechanism of strained semiconductor bilayers grown by molecular beam epitaxy. Recently, we reported on hybrid systems in which microtubes, that act as passive optical resonators, are coupled to chemically synthesized nanocrystals, that act as active light emitters.[1] A solution of nanocrystals was filled into the hollow core of the microtubes. Their coupling to optical modes of the microtubes is made possible by the microtubes’ thin walls (typically 40 to 100 nm) that lead to long-ranging evanescent fields into the microtube core. The use of AlInGaAs-based microtubes restricted the choice of possible nanocrystals to systems emitting below 1.65 eV, i.e., the band gap of the layer system. In this work we report on the successful fabrication of AlInP-based microtubes with larger band gap allowing to operate the resonators in the visible spectral range. We demonstrate optical modes in these microtube resonators by coupling them to highly luminescent CdSe-based core-shell colloidal nanocrystals.
We acknowledge financial support by the DFG via KI1257/1.
[1] K. Dietrich et al., Nano Letters 10, 627 (2010).