Topology optimized mode conversion in a photonic crystal waveguide fabricated in siliconon-insulator material

Lars Hagedorn Frandsen, Yuriy Elesin, Louise Floor Frellsen, Miranda Mitrovic, Yunhong Ding, Ole Sigmund, Kresten Yvind

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Abstract

We have designed and for the first time experimentally verified a topology optimized mode converter with a footprint of ∼6.3 μm × ∼3.6 μm which converts the fundamental even mode to the higher order odd mode of a dispersion engineered photonic crystal waveguide. 2D and 3D topology optimization is utilized and both schemes result in designs theoretically showing an extinction ratio larger than 21 dB. The 3D optimized design has an experimentally estimated insertion loss lower than ∼2 dB in an ∼43 nm bandwidth. The mode conversion is experimentally confirmed in this wavelength range by recording mode profiles using vertical grating couplers and an infrared camera. The experimentally determined extinction ratio is > 12 dB and is believed to be limited by the spatial resolution of our setup. © 2014 Optical Society of America.
Original languageEnglish
JournalOptics Express
Volume22
Issue number7
Pages (from-to)8525-8532
ISSN1094-4087
DOIs
Publication statusPublished - 2014

Keywords

  • Light extinction
  • Optimization
  • Three dimensional
  • Topology
  • Extinction ratios
  • Infra-red cameras
  • Optimized designs
  • Photonic crystal waveguide
  • Silicon-on-insulator materials
  • Spatial resolution
  • Vertical gratings
  • Wavelength ranges
  • Optical waveguides

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