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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 9 — May. 5, 2014
  • pp: 11021–11028

High efficiency asymmetric directional coupler for slow light slot photonic crystal waveguides

Yameng Xu, Charles Caer, Dingshan Gao, Eric Cassan, and Xinliang Zhang  »View Author Affiliations

Optics Express, Vol. 22, Issue 9, pp. 11021-11028 (2014)

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An asymmetric directional coupler scheme for the efficient injection of light into slow light slot photonic crystal waveguide modes is proposed and investigated using finite-difference time-domain simulation. Coupling wavelengths can be flexibly controlled by the geometrical parameters of a side-coupled subwavelength corrugated strip waveguide. This approach leads to a ~1dB insertion loss level up to moderately high light group indices (nG≈30) in wavelength ranges of 5-10nm. This work brings new opportunities to inject light into the slow modes of slot photonic crystal waveguides for on-chip communications using hybrid silicon photonics or sensing based on hollow core waveguides.

© 2014 Optical Society of America

OCIS Codes
(130.5296) Integrated optics : Photonic crystal waveguides
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Photonic Crystals

Original Manuscript: April 14, 2014
Manuscript Accepted: April 23, 2014
Published: April 30, 2014

Yameng Xu, Charles Caer, Dingshan Gao, Eric Cassan, and Xinliang Zhang, "High efficiency asymmetric directional coupler for slow light slot photonic crystal waveguides," Opt. Express 22, 11021-11028 (2014)

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