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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 2 — Jan. 22, 2007
  • pp: 266–277

All-dielectric unidirectional dual-grating output coupler

Andrew B. Greenwell, Sakoolkan Boonruang, and M. G. Moharam  »View Author Affiliations

Optics Express, Vol. 15, Issue 2, pp. 266-277 (2007)

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A novel concept for an all-dielectric unidirectional output double-grating coupler is proposed and rigorously analyzed. In addition to a superstrate side grating, a second grating is placed on the substrate side. The periodicities of the gratings are chosen such that no propagating diffracted orders are present outside the structure in the superstrate region and only a single order is present outside the structure in the substrate region. The concept provides a robust output coupler requiring neither phase-matching between gratings nor any resonances in the structure, and is very tolerant to potential fabrication errors. Up to 96% coupling efficiency from the substrate-side grating is obtained over a wide range of grating properties.

© 2007 Optical Society of America

OCIS Codes
(050.0050) Diffraction and gratings : Diffraction and gratings
(130.0130) Integrated optics : Integrated optics

ToC Category:
Diffraction and Gratings

Original Manuscript: October 24, 2006
Revised Manuscript: November 27, 2006
Manuscript Accepted: November 27, 2006
Published: January 22, 2007

Andrew B. Greenwell, Sakoolkan Boonruang, and M. G. Moharam, "All-dielectric unidirectional dual-grating output coupler," Opt. Express 15, 266-277 (2007)

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