A slow group velocity and low group velocity dispersion photonic crystal slab waveguide is designed by using capsule shaped air holes in hexagonal lattice. The theoretical study shows that adjusting the aspect ratio of holes in the innermost rows can fine tune the dispersion tail. The presented design can achieve nearly flat band photonic crystal waveguides with group index of 21-36 over the normalized bandwidth (delta omega/omega) of 1.38%0.4%. We ...
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