# 10 - Light-path engineering in disordered waveguiding systems

**Source**: https://www.cs.tum.de/spp1839/projects/1st-period-2015-2018/10.html
**Parent**: https://www.cs.tum.de/spp1839/projects.html

Concept
of a disordered waveguiding system with engineered light paths based on
a lithographically structured free-standing membrane with multiple
input and output ports. The output ports are terminated with nanowire
waveguide detectors

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Integrated nanophotonic circuits allow for
realizing complex optical functionality in a compact and reproducible
fashion through high-yield nanofabrication. Typically configured for
single-mode operation in a single path, the optical propagation
direction in such devices is determined by the waveguide layout which
inherently requires smooth surfaces without scattering and restricts
the device footprint to the limits of total internal reflection. By
moving forward to multi-mode and multi-path designs in intentionally
disordered waveguide structures, we will harness in-plane scattering
effects to realize a new class of functional waveguiding devices.
Through light-path engineering of free-standing dielectric membranes
compact and broadband optical systems will be derived for operation in
the classical and quantum regime. Our approach is based on multi-path
interference, leading to the generation of wavelength dependent speckle
patterns at the output of a tailored photonic nanostructure.

## Contributors

- [Prof. Kurt Busch](https://top.physik.hu-berlin.de/people/kurt-busch)
- Paraschos Varytis
- [Prof. Wolfram Hans Peter Pernice](https://www.uni-muenster.de/Physik.PI/Pernice/)
- Wladick Hartmann

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