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We propose a practical and efficient solution for the coupling of light fromintegrated single-mode waveguides to supercollimating planar photonic crystalson conventional silicon-on-insulator platforms. The device consists of a ribwaveguide, designed to sustain spatially extended single-modes and matched to asupercollimating photonic crystal, which has been truncated at its boundary toimprove impedance matching between the two photonic components.Three-dimensional simulations show transmission efficiencies up to 96 % andreflections below 0.2 % at wavelengths close to 1.55 microns. This approachconstitutes a significant step toward the integration of supercollimatingstructures on photonic chips.

Efficient light coupling from integrated single-mode waveguides to supercollimating photonic crystals on silicon-on-insulator platforms