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A slow-group-velocity-and low-group-velocitydispersion 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 (∆ω/ω) of 1.38%-0.4%. We also discuss the effects of the change in the holes' aspectdoi:10.21236/ada506807 fatcat:igufggk3gfb55nysus2u2aru2i