Efficient small grating couplers for low-index difference waveguide systems

Roman Bruck; Rainer Hainberger

doi:10.1117/12.808166

9 February 2009 Efficient small grating couplers for low-index difference waveguide systems

Roman Bruck, Rainer Hainberger

Proceedings Volume 7218, Integrated Optics: Devices, Materials, and Technologies XIII; 72180A (2009) https://doi.org/10.1117/12.808166
Event: SPIE OPTO: Integrated Optoelectronic Devices, 2009, San Jose, California, United States

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.

Citation Download Citation

Roman Bruck and Rainer Hainberger "Efficient small grating couplers for low-index difference waveguide systems", Proc. SPIE 7218, Integrated Optics: Devices, Materials, and Technologies XIII, 72180A (9 February 2009); https://doi.org/10.1117/12.808166

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