1 January 2008 Ultracompact tapers for light coupling into two-dimensional slab photonic-crystal waveguides in the slow light regime
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Abstract
Optical coupling from a strip waveguide to a two-dimensional photonic crystal (PC) slab waveguide in the slow light regime is investigated. Group-velocity mismatch between optical modes is responsible for large coupling loss. Typical devices based on a W1 PC waveguide, with strip input and output waveguides on each side, are studied using finite-difference time-domain and plane-wave expansion calculations. Compact tapers based on PC lattice parameter tuning are proposed to reduce the coupling loss. At 1.6 μm, for an optical mode with group velocity vg/c=0.054, the transmission can be enhanced from 18% without tapers to 95% with a 3.4-μm-long taper on each side of the PC.
© (2008) Society of Photo-Optical Instrumentation Engineers (SPIE)
Delphine Marris-Morini, Delphine Marris-Morini, Eric Cassan, Eric Cassan, Damien Bernier, Damien Bernier, Guillaume Maire, Guillaume Maire, Laurent Vivien, Laurent Vivien, } "Ultracompact tapers for light coupling into two-dimensional slab photonic-crystal waveguides in the slow light regime," Optical Engineering 47(1), 014602 (1 January 2008). https://doi.org/10.1117/1.2831132 . Submission:
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