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

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4 Author(s)
Vynck, K. ; Groupe d’Etude des Semiconducteurs, UMR 5650 CNRS-Université Montpellier II, CC074, Place E. Bataillon, 34095 Montpellier Cedex 05, France ; Centeno, E. ; Le Vassor dYerville, M. ; Cassagne, D.

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We propose a practical and efficient solution for the coupling of light from integrated single-mode waveguides to supercollimating planar photonic crystals (PhCs) on conventional silicon-on-insulator platforms. The device consists of a rib waveguide, designed to sustain spatially extended single modes and matched to a supercollimating PhC, which has been truncated at its boundary to improve impedance matching between the two photonic components. Three-dimensional simulations show transmission efficiencies up to 96% and reflections below 0.2% at wavelengths close to 1.55 μm. This approach constitutes a significant step toward the integration of supercollimating structures on photonic chips.

Published in:

Applied Physics Letters  (Volume:92 ,  Issue: 10 )

Date of Publication:

Mar 2008

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