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Proceedings Paper

Efficient small grating couplers for low-index difference waveguide systems
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Paper Abstract

Due to the small coupling strength of waveguide grating couplers in low index contrast material systems such as polymers, the efficient coupling to single-mode waveguides via surface gratings represents a severe challenge. In this work, we demonstrate that the coupling strength of grating couplers in low-index difference waveguide systems can be strongly enhanced by the application of a thin high-index coating (HIC) on top of surface gratings. This allows reducing the grating coupler aperture size without sacrificing efficiency by up to more than an order of magnitude, which enables low-loss lateral tapering to single-mode waveguides.

Paper Details

Date Published: 9 February 2009
PDF: 11 pages
Proc. SPIE 7218, Integrated Optics: Devices, Materials, and Technologies XIII, 72180A (9 February 2009); doi: 10.1117/12.808166
Show Author Affiliations
Roman Bruck, Austrian Research Ctrs. GmbH (Austria)
Rainer Hainberger, Austrian Research Ctrs. GmbH (Austria)

Published in SPIE Proceedings Vol. 7218:
Integrated Optics: Devices, Materials, and Technologies XIII
Jean-Emmanuel Broquin; Christoph M. Greiner, Editor(s)

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