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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • 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)
http://dx.doi.org/10.1364/OL.32.001794


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Abstract

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

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

Citation
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)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-32-13-1794

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