Wideband slow light in photonic crystal slab waveguide based on geometry adjustment and optofluidic infiltration

In this paper, a photonic crystal slab waveguide with wideband slow light, large group index (n(g)), and very low group velocity dispersion (GVD) has been presented. The structure is designed by shifting the first row of the air holes adjacent to the waveguide center in the longitudinal direction, and optofluidic infiltration in the second row By applying optimized parameters for the two rows, a flexible control of n(g)(17.5 < n(g) < 133) with large bandwidth (2 nm < Delta lambda < 23 nm) is obtained. The GVD decreased at the range of 10(-22) s(2)/m. Numerical simulations are performed by the three-dimensional plane-wave expansion method. (C) 2013 Optical Society of America