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Humboldt-Universität zu Berlin - Mathematisch-Naturwissen­schaft­liche Fakultät - Nanooptik

Humboldt-Universität zu Berlin | Mathematisch-Naturwissen­schaft­liche Fakultät | Institut für Physik | Nanooptik | Publications | Miniaturized Bragg-grating couplers for SiN-photonic crystal slabs

Carlo Barth, Janik Wolters, Andreas Schell, Jürgen Probst, Max Schoengen, Bernd Löchel, Stefan Kowarik, and Oliver Benson (2015)

Miniaturized Bragg-grating couplers for SiN-photonic crystal slabs

Optics Express, 23.

We report on an experimental and theoretical investigation of an integrated Bragg-like grating coupler for near-vertical scattering of light from photonic crystal waveguides with an ultra-small footprint of a few lattice constants only. Using frequency-resolved measurements, we find the directional properties of the scattered radiation and prove that the coupler shows a good performance over the complete photonic bandgap. The results compare well to analytical considerations regarding 1d-scattering phenomena as well as to FDTD simulations. Link