# 05 - Disordered photonic structures in organic microlasers

**Source**: https://www.cs.tum.de/spp1839/projects/1st-period-2015-2018/05.html
**Parent**: https://www.cs.tum.de/spp1839/projects.html

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.

## Contributors

- [Prof. Karl Leo](https://forschungsinfo.tu-dresden.de//detail/professur/349)
- Dipl.-Phys. Andreas Mischok
- Dipl.-Phys. Tim Wagner
- M.Sc. Stefan Meister

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