Dresden 2006 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 55: Photonic crystals
HL 55.4: Vortrag
Freitag, 31. März 2006, 12:15–12:30, BEY 154
Polarization splitting and terahertz oscillations from a single planar Fabry-Perot microcavity — •R. Gehlhaar1, M. Swoboda1, M. Sudzius1, H. Wendrock2, M. Hoffmann1, H. Fröb1, V. G. Lyssenko1, and K. Leo1 — 1Institut für Angewandte Photophysik, Technische Universität Dresden, 01062 Dresden, Germany, www.iapp.de — 2Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, PF 27 01 16, 01171 Dresden, Germany
We report the experimental observation of polarization splitting and terahertz oscillations of transmitted coherent light from a single planar optical microcavity consisting of two SiO2/TiO2-dielectric mirrors. The samples are prepared by reactive electron-beam deposition. Optical anisotropy leads to two perpendicularly polarized transmission modes at ∼ 800 nm with a splitting of 2.5 nm. We ascribe the anisotropy to oblique columnar structures in the dielectrics, resulting from off-axial growth of the microcavity structure. Therefore the beating frequency is widely tunable in the GHz and THz range by variations in the fabrication process. We apply an up-conversion setup for temporally and spectrally resolved measurements and obtain a corresponding beating of 0.8 ps period or 1.25 THz oscillation frequency. Time resolved measurements yield a cavity photon lifetime of 0.65 ps, corresponding to a Q-value of 1600. To explain our observations, we introduce a Fourier-transform-based analytical model.