Thin shallow-ridge silicon-on-insulator waveguide transitions and tapers

Naser Dalvand, Thach G. Nguyen, Thomas L. Koch, Arnan Mitchell

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


We analyze transitions from low-loss 'magic' width to strongly radiating 'anti-magic' width thin, shallow-ridge silicon-on-insulator waveguides operating in the transverse magnetic mode, using a vector eigenmode expansion method. It is shown that the transition produces a beam of transverse electric (TE) radiation with a pattern, which is strongly dependent on the geometry of the transition. It is shown that controlled, highly coherent, and low-divergence TE beam can be emitted from a relatively compact linear taper. Methods for side lobe suppression are also analyzed and avenues for more sophisticated beam shaping are identified drawing inspiration from leaky wave antennas.

Original languageEnglish (US)
Article number6365228
Pages (from-to)163-166
Number of pages4
JournalIEEE Photonics Technology Letters
Issue number2
StatePublished - 2013


  • Leaky wave antenna
  • silicon-on-insulator (SOI) waveguides
  • vector eigenmode expansion method

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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