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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 33, Iss. 22 — Nov. 15, 2008
  • pp: 2644–2646

Efficient slow-light coupling in a photonic crystal waveguide without transition region

T. P. White, L. C. Botten, C. Martijn de Sterke, K. B. Dossou, and R. C. McPhedran  »View Author Affiliations

Optics Letters, Vol. 33, Issue 22, pp. 2644-2646 (2008)

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We consider the coupling into a slow mode that appears near an inflection point in the band structure of a photonic crystal waveguide. Remarkably, the coupling into this slow mode, which has a group index n g > 1000 , can be essentially perfect without any transition region. We show that this efficient coupling occurs thanks to an evanescent mode in the slow medium, which has appreciable amplitude and helps satisfy the boundary conditions but does not transport any energy.

© 2008 Optical Society of America

OCIS Codes
(350.4238) Other areas of optics : Nanophotonics and photonic crystals
(130.5296) Integrated optics : Photonic crystal waveguides

ToC Category:
Integrated Optics

Original Manuscript: July 16, 2008
Revised Manuscript: September 24, 2008
Manuscript Accepted: September 25, 2008
Published: November 12, 2008

T. P. White, L. C. Botten, C. Martijn de Sterke, K. B. Dossou, and R. C. McPhedran, "Efficient slow-light coupling in a photonic crystal waveguide without transition region," Opt. Lett. 33, 2644-2646 (2008)

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  9. At negative k[Re(k)d/(2π)=−0.38] there are also two evanescent modes, one of which decays with z. It has a field in which the f+/- are switched, and it therefore does not match the forward-propagating slow mode well; we therefore ignore it in our qualitative description, and indeed it plays virtually no role in the coupling.

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