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HL: Fachverband Halbleiterphysik
HL 39: Optical properties
HL 39.6: Talk
Tuesday, March 12, 2013, 11:45–12:00, H13
Rolled-up microtubes for light-matter interaction with colloidal quantum dots — •Stefanie Kietzmann1, Christian Strelow1, Andreas Schramm2, Jussi-Pekka Penttinen2, Alf Mews1, and Tobias Kipp1 — 1Institute of Physical Chemistry, University of Hamburg, Germany — 2Optoelectronics Research Centre, Tampere University of Technolgy, Tampere, Finland
We report on rolled-up AlInP microtube resonators that can be coupled to colloidal nanocrystals emitting in the visible spectral range. These emitters can couple to the evanescent fields of the modes propagating in the very thin microtube walls, leading to sharp optical modes in the emission spectra due to constructive interference. Microtubes are fabricated by utilizing the self-rolling mechanism of expitaxally grown strained layer systems induced by selective chemical undercutting. Three-dimensional light confinement by various axial structurings of the tube geometry allows for a full control over the optical eigenmodes. As the mode energies of the spectra sensitively depend on the refractive index of the tube’s filling, microtube resonators can be used as refractive index sensors. We present a successful coupling of colloidal nanocrystals to the evanescent fields of AlInP microtubes shown by sharp resonances in the observed spectrum. Moreover, the refractometer properties of the microtubes are demonstrated by comparing the observed mode shift due to a well-known refractive index change to 2D FDTD simulations [1].
We acknowledge financial support by the DFG via Ki1257/1.
[1] Ch. Strelow et.al., Appl. Phys. Lett. 101, 113114 (2012)