Applied Physics B

, Volume 81, Issue 2–3, pp 283–293

Roughness losses and volume-current methods in photonic-crystal waveguides

  • S. G. Johnson
  • M. L. Povinelli
  • M. Soljačić
  • A. Karalis
  • S. Jacobs
  • J. D. Joannopoulos
Article

Abstract

We present predicted relative scattering losses from sidewall roughness in a strip waveguide compared to an identical waveguide surrounded by a photonic crystal with a complete or incomplete gap in both 2d and 3d. To do so, we develop a new semi-analytical extension of the classic “volume-current method” (Green’s functions with a Born approximation), correcting a longstanding limitation of such methods to low-index contrast systems (the classic method may be off by an order of magnitude in high-contrast systems). The resulting loss predictions show that even incomplete gap structures such as photonic-crystal slabs should, with proper design, be able to reduce losses by a factor of two compared to an identical strip waveguide; however, incautious design can lead to increased losses in the photonic-crystal system, a phenomena that we explain in terms of the band structure of the unperturbed crystal.

PACS

42.25.Fx 42.70.Qs 42.79.Gn 

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • S. G. Johnson
    • 1
  • M. L. Povinelli
    • 2
  • M. Soljačić
    • 1
  • A. Karalis
    • 1
  • S. Jacobs
    • 3
  • J. D. Joannopoulos
    • 1
  1. 1.Massachusetts Institute of TechnologyCambridgeUSA
  2. 2.Ginzton LaboratoryStanford UniversityStanfordUSA
  3. 3.OmniGuide CommunicationsCambridgeUSA

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