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

Abstract

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 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 micrometers.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2009
Accession Number
ADA506807

Entities

People

  • Amie Hosseini
  • David Kwong
  • Emanuel Tutuc
  • Ray T Chen
  • Seth R. Bank
  • Wei Jiang
  • Yang Zhao
  • Yun-shen Chen

Organizations

  • University of Texas at Austin

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Advanced Materials
  • Aspect Ratio
  • Band Gaps
  • Band Structures
  • Crystals
  • Dispersion Relations
  • Energy Bands
  • Engineering
  • Fabrication
  • Frequency
  • Geometric Forms
  • Geometry
  • Group Velocity
  • Materials
  • Photonic Crystals
  • Two Dimensional
  • Waveguides

Fields of Study

  • Physics

Readers

  • Explosive Engineering.
  • Microwave Engineering.
  • Optical Physics and Photonics.