How planar optical waves can be made to climb dielectric steps.

@article{Hammer2015HowPO,
  title={How planar optical waves can be made to climb dielectric steps.},
  author={Manfred Hammer and Andre Hildebrandt and Jens F{\"o}rstner},
  journal={Optics letters},
  year={2015},
  volume={40 16},
  pages={3711-4}
}
We show how to optically connect guiding layers at different elevations in a 3-D integrated photonic circuit. Transfer of optical power carried by planar, semi-guided waves is possible without reflections or radiation losses, and over large vertical distances. This functionality is realized through simple step-like folds of high-contrast dielectric slab waveguides, in combination with oblique wave incidence, and fulfilling a resonance condition. Radiation losses vanish, and polarization… CONTINUE READING