Delay Time Enhanced Flat Band Photonic Crystal Waveguides with Capsule-shaped Holes on Silicon Nanomembrane [report]

Yun-Shen Chen, Yang Zhao, Amie Hosseini, David Kwong, Wei Jiang, Seth R. Bank, Emanuel Tutuc, Ray T. Chen
2009 unpublished
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' aspect
more » ... ratio combined with a slight size adjustment. The group index in the range of 21-43 for normalized bandwidth of about 1.5%-0.3% is obtained with the combination effect. The optimized designed exhibits a nearly constant group index of 21 over 22.7 nanometer bandwidth at λ = 1.55 µm. Index Terms-Group velocity dispersion, photonic crystal waveguide, slow group velocity.
doi:10.21236/ada506807 fatcat:igufggk3gfb55nysus2u2aru2i