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- W98935237 abstract "This thesis describes the optical investigation of photonic crystals containing implemented defects. The highly wavelength dependent properties of the structures have been studied with high spatial resolution using a novel method which combines spectroscopic and near-field optical techniques. At present macroporous silicon is the only system which allows the fabrication of deep two-dimensional photonic crystals. Here, fundamental defect structures have been examined, which are of great interest for the realization of integrated optical circuits: point defects and line defects. The former represent resonators, that can confine light to a very small volume and the latter are the smallest optical waveguides that can be realized and into which further elements can be implemented such as bends or beam splitters. The spectrally and spatially highly confined modes of a point defect micro resonator were excited by a widely tunable optical parametric oscillator. An optical near field probe was used as a local detector, in order to collect the light transmitted by the structure. By scanning the fiber tip against the exit plane of the photonic crystal the intensity distribution of the transmitted light could be imaged. Repeating this measurement with different wavelengths resulted in the transmission spectrum of the structure. It contains two sharp resonances with quality factors of 190 and 640. In order to image the modes of the resonator, a second near-field probe was approached to the top side of the photonic crystal. It extracts locally energy from the resonator mode, so that by scanning the surface the intensity distribution in the resonator could directly be imaged. For the first time it could be shown experimentally that the extension of a defect mode ist significantly smaller than the optical wavelength. Investigations on a Y-shaped structure showed, that such a configuration works as a highly integrated beam splitter. The light power was symmetrically divided into the two output branches of the beam splitter. Distance dependent measurements at the exit of a line defect showed that the beam transmitted by the structure much less divergent than expected from a subwavelength aperture. This result is in very good agreement with theoretical simulations." @default.
- W98935237 created "2016-06-24" @default.
- W98935237 creator A5013193207 @default.
- W98935237 date "2002-01-01" @default.
- W98935237 modified "2023-09-24" @default.
- W98935237 title "Mikroskopie und Spektroskopie an photonischen Kristallen : Einschluss von Licht auf Subwellenlängen-Bereiche" @default.
- W98935237 hasPublicationYear "2002" @default.
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