We present an adiabatic taper design in three dimensions for coupling light into photonic crystal defect waveguides in a square lattice of circular dielectric rods. The taper is a two-stage structure in which the first stage makes the transition from a dielectric waveguide to a coupled-cavity waveguide. The second stage subsequently transforms the waveguide mode from an index-guided mode to a band-gap-guided mode. We discuss differences between the two-dimensional device and its three-dimensional slab version.
© 2003 Optical Society of America
(060.1810) Fiber optics and optical communications : Buffers, couplers, routers, switches, and multiplexers
(130.3120) Integrated optics : Integrated optics devices
(230.7370) Optical devices : Waveguides
Peter Bienstman, Solomon Assefa, Steven G. Johnson, John D. Joannopoulos, Gale S. Petrich, and Leslie A. Kolodziejski, "Taper structures for coupling into photonic crystal slab waveguides," J. Opt. Soc. Am. B 20, 1817-1821 (2003)