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HL: Fachverband Halbleiterphysik
HL 9: Poster 1
HL 9.80: Poster
Montag, 23. März 2009, 14:30–17:00, P2
PLD-growth of ZnO-based planar and cylindrical microresonators — •Helena Hilmer, Chris Sturm, Rüdiger Schmidt-Grund, Jesús Zúñiga-Pérez, Jan Sellmann, Annekatrin Hinkel, Christian Czekalla, Jörg Lenzner, Gregor Zimmermann, Holger Hochmuth, Michael Lorenz, Bernd Rheinländer, and Marius Grundmann — Universität Leipzig, Institut für Experimentelle Physik II, Linnéstr. 5, 04103 Leipzig
We have grown planar and cylindrical microresonators by means of pulsed laser deposition containing as active medium a half wavelength ZnO-cavity and free-standing ZnO-nanopillars with diameters of (50−500) nm and (5−10) µm in length, respectively. These cavities are embedded between two all-oxide Bragg reflectors (BR) respective coated with coaxial BR made of quarter-wave stacks of yttria stabilised zirconia (YSZ) and Al2O3. Atomic force microscopy and scanning transmission electron microscopy show very smooth interfaces for the planar BR (average roughness Ra=1 nm). For the cylindrical BR we have reached excellent quality of lateral and longitudinal homogeneous layers around the ZnO-nanopillars.
Photoluminescence spectroscopy (PL) and reflectivity (R) measurements have revealed the planar resonator to be in the strong coupling regime up to 410 K with a maximum Rabi splitting of the polariton branches of about 90 meV (PL) and 95 meV (R) at 10 K. Room-temperature spatially resolved PL and R spectra of the coated nanopillars show structures related to exciton-polariton branches in photonic wires.