Delay-Time-Enhanced Flat-Band Photonic Crystal Waveguides with Capsule-Shaped Holes on Silicon Nanomembrane

作者：Chen Yun Sheng^*; Zhao Yang; Hosseini Amir; Kwong David; Jiang Wei; Bank Seth R; Tutuc Emanuel; Chen Ray T

来源：IEEE Journal of Selected Topics in Quantum Electronics, 2009, 15(5): 1510-1514.

DOI：10.1109/JSTQE.2009.2020811

• Group velocity dispersion
• photonic crystal waveguide
• slow group velocity

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 138%4.4%. We also discuss the effects of the change in the holes' aspect 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 lambda = 1.55 mu m.

• 出版日期2009-10
• 单位rutgers