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Optics Letters

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  • 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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References

  1. P. Cheben, Optical Waveguides: from Theory to Applied Technologies, M.L.Calvo and V.Lakshminarayanan, eds. (CRC, 2007), Chap. 5.
  2. H. Kikuta, H. Toyota, and W. Yu, Opt. Rev. 10, 63 (2003). [CrossRef]
  3. P. Cheben, D.-X. Xu, S. Janz, and A. Densmore, Opt. Express 14, 4695 (2006). [CrossRef] [PubMed]
  4. J. H. Schmid, P. Cheben, S. Janz, J. Lapointe, E. Post, A. Delâge, A. Densmore, B. Lamontagne, P. Waldron, D.-X. Xu, presented at The European Conference on Lasers and Electro-Optics, Munich, Germany, June 17-22, 2007.
  5. J. H. Schmid, presented at GHI and Microphotonics Meeting (Institute for Microstructural Sciences, National Research Council of Canada, 2006).
  6. A. O. Dirisu, G. Silva, Z. Liu, C. F. Gmachl, F. J. Towner, J. Bruno, and D. L. Sivco, IEEE Photon. Technol. Lett. 19, 221 (2007). [CrossRef]
  7. S. M. Rytov, Sov. Phys. JETP 2, 466 (1956).
  8. W. H. Southwell, J. Opt. Soc. Am. A 8, 549 (1991). [CrossRef]
  9. D. H. Raguin and G. M. Morris, Appl. Opt. 32, 2582 (1993). [CrossRef] [PubMed]

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