We study adiabatic mode transformations in photonic-crystal integrated circuits composed of a triangular lattice of holes etched into a planar waveguide. The taper relies on the manufacture of holes with progressively-varying dimensions. The variation synthesizes an artificial material with a gradient effective index. Calculations performed with a three-dimensional exact electromagnetic theory yield high transmission over a wide frequency range. To evidence the practical interest of the approach, a mode transformer with a length as small as λ/2 is shown to provide a spectral-averaged transmission efficiency of 92% for tapering between a ridge waveguide and a photonic crystal waveguide with a one-row defect. © 2002 Optical Society of America.
CITATION STYLE
Lalanne, P., & Talneau, A. (2002). Modal conversion with artificial materials for photonic-crystal waveguides. Optics Express, 10(8), 354. https://doi.org/10.1364/oe.10.000354
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