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Compact focusing grating couplers for silicon horizontal slot waveguides

R. A. Larrea, A. M. Gutiérrez, J. Hurtado, J. M. Ramírez, B. Garrido, and P. Sanchis

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Abstract

In this Letter, we present the design, simulation (2D and 3D), fabrication, and experimental characterization of compact and fully etched focusing gratings for a horizontal slot waveguide based on a silicon nitride layer sandwiched between amorphous silicon and a silicon-on-insulator. The measured coupling losses are about 4 dB with a 3 dB bandwidth of 38 nm. The fully etched configuration allows the fabrication in a single lithography step.

© 2017 Optical Society of America

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