Delay-time-enhanced flat-band photonic crystal waveguides with capsule-shaped holes on silicon nanomembrane

Yun Sheng Chen, Yang Zhao, Amir Hosseini, David Kwong, Wei Jiang, Seth R. Bank, Emanuel Tutuc, Ray T. Chen

Research output: Contribution to journalArticlepeer-review


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 2136 over the normalized bandwidth (Δω / ω) of 1.380.4. 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 2143 for normalized bandwidth of about 1.50.3 is obtained with the combination effect. The optimized designed exhibits a nearly constant group index of 21 over 22.7 nanometer bandwidth at λ = 1.55μm.

Original languageEnglish (US)
Article number5256334
Pages (from-to)1510-1514
Number of pages5
JournalIEEE Journal on Selected Topics in Quantum Electronics
Issue number5
StatePublished - Sep 2009
Externally publishedYes


  • Group velocity dispersion
  • Photonic crystal waveguide
  • Slow group velocity

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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