Abstract

We designed, fabricated, and characterized broadband, efficient, all-dielectric metamaterial-waveguide bends (MWBs) that redirect light by 180 deg. The footprint of each MWB is 3μm×3μm and redirection is achieved for single-mode waveguides spaced by 1.3 μm, which corresponds to an effective bend radius of 0.65 μm (<λ0/2 for λ0=1.55μm). The designed and measured transmission efficiencies are >80% and 70%, respectively. Furthermore, the MWBs have an operating bandwidth >66nm (design) and >56nm (experiments). Our design methodology that incorporates fabrication constraints enables highly robust devices. The methodology can be extended to the general routing of light in tight spaces for large-scale photonic integration.

© 2015 Optical Society of America

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