Disordered photonic structures in organic microlasers

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Microcavities are an ideal model system to investigate the transition from ordered to disordered photonic structures, furthermore, they immediately lead to interesting application perspectives. The aim of this project is thus the investigation of metal-organic microcavities (MCs) with additional lateral patterning leading to a spatial, angular, and spectral control of the spontaneous and stimulated emission modes in organic microlasers. Starting from single photonic wires and periodic wire arrays inside of such MCs, we plan to introduce finely tunable defects enhancing trapping of light, increasing the density of optical states, and finally leading to improved device characteristics such as a decrease of lasing thresholds in organic lasers. Furthermore, aperiodic and quasi-crystal-like patterning is to be investigated, with a systematic study of the transition from periodic to aperiodic to completely disordered patterns, utilizing high-resolution near and far field spectroscopy as well as mapping the temporal field development in such cavities. Finally, the suitability of such metallic patterns for charge carrier injection in MC-light emitting diodes and -lasers is to be investigated. The results of this project should provide a basis for novel or significantly improved photonic devices.