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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 15 — Jul. 23, 2007
  • pp: 9625–9630

Efficient, broadband and compact metal grating couplers for silicon-on-insulator waveguides

Stijn Scheerlinck, Jonathan Schrauwen, Frederik Van Laere, Dirk Taillaert, Dries Van Thourhout, and Roel Baets  »View Author Affiliations


Optics Express, Vol. 15, Issue 15, pp. 9625-9630 (2007)
http://dx.doi.org/10.1364/OE.15.009625


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Abstract

Compact metal grating couplers for efficient and broadband coupling between optical fibers and silicon-on-insulator waveguides are proposed and demonstrated. Simulation results for silver, gold, aluminum and copper grating couplers are presented. Using a uniform silver grating, coupling efficiencies are calculated as high as 60 % at a wavelength of 1.55 µm. Metal grating couplers require only one single etching or lift-off step and are therefore very easy to fabricate. As a proof of principle, a gold grating coupler for near-vertical fiber-to-waveguide coupling was fabricated using e-beam writing and lift-off, demonstrating 34 % coupling efficiency and a 1 dB-bandwidth of 40 nm. Measurement data and simulation results are in good agreement.

© 2007 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(130.0130) Integrated optics : Integrated optics

ToC Category:
Diffraction and Gratings

History
Original Manuscript: May 1, 2007
Revised Manuscript: June 28, 2007
Manuscript Accepted: July 8, 2007
Published: July 18, 2007

Citation
Stijn Scheerlinck, Jonathan Schrauwen, Frederik Van Laere, Dirk Taillaert, Dries Van Thourhout, and Roel Baets, "Efficient, broadband and compact metal grating couplers for silicon-on-insulator waveguides," Opt. Express 15, 9625-9630 (2007)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-15-9625


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References

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