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Optics Letters

Optics Letters


  • Editor: Anthony J. Campillo
  • Vol. 32, Iss. 13 — Jul. 1, 2007
  • pp: 1794–1796

Gradient-index antireflective subwavelength structures for planar waveguide facets

J. H. Schmid, P. Cheben, S. Janz, J. Lapointe, E. Post, and D.-X. Xu  »View Author Affiliations

Optics Letters, Vol. 32, Issue 13, pp. 1794-1796 (2007)

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We demonstrate the use of subwavelength gratings etched into the facets of silicon-on-insulator ridge waveguides as a means of reducing facet reflectivity by the gradient-index effect. Reflectivities as low as 2.0% and 2.4% for the fundamental TE and TM modes, respectively, are demonstrated experimentally for light of 1.55 μ m wavelength, in agreement with both effective medium theory and finite-difference time domain calculations. Simulations show that facet reflectivites can be further reduced to less than 1% by increasing the grating modulation depth.

© 2007 Optical Society of America

OCIS Codes
(130.5990) Integrated optics : Semiconductors
(230.3990) Optical devices : Micro-optical devices
(230.7390) Optical devices : Waveguides, planar
(310.1210) Thin films : Antireflection coatings
(350.2770) Other areas of optics : Gratings
(350.3950) Other areas of optics : Micro-optics

ToC Category:
Optical Devices

Original Manuscript: February 28, 2007
Revised Manuscript: April 30, 2007
Manuscript Accepted: May 1, 2007
Published: June 18, 2007

J. H. Schmid, P. Cheben, S. Janz, J. Lapointe, E. Post, and D.-X. Xu, "Gradient-index antireflective subwavelength structures for planar waveguide facets," Opt. Lett. 32, 1794-1796 (2007)

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  1. P. Cheben, Optical Waveguides: from Theory to Applied Technologies, M.L.Calvo and V.Lakshminarayanan, eds. (CRC, 2007), Chap. 5.
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