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Wideband slab photonic crystal waveguides for slow light using differential optofluidic infiltration

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Abstract

A new type of wideband slow light with a large delay bandwidth product in a slab photonic crystal waveguide with a triangular lattice of circular air holes in a silicon-on-insulator substrate based on optofluidic infiltration is demonstrated. It is shown that dispersion engineering through infiltrating optical fluids—with different refractive indices n1f and n2f—in the first two rows of the air holes innermost to the waveguide results in an improved normalized delay bandwidth product ranging from 0.187 to 0.377 with large bandwidth (12nm<Δλ<32nm) and group index (14.20<ng<24.62) around 1550 nm. The nearly zero group velocity dispersion on the order of 1020s2/m is achieved in all of the structures. These results are obtained by numerical simulation based on a three-dimensional-plane-wave expansion method.

© 2015 Optical Society of America

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