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Optics Letters

Optics Letters


  • Vol. 18, Iss. 22 — Nov. 15, 1993
  • pp: 1919–1921

Single-leakage-channel grating couplers: comparison of theoretical and experimental branching ratios

Ronald L. Roncone, Lifeng Li, and John C. Brazas  »View Author Affiliations

Optics Letters, Vol. 18, Issue 22, pp. 1919-1921 (1993)

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Fabrication and characterization of a waveguide grating that is highly efficient in producing a single channel of output-coupled light are described. The thin-film assembly consisted of a waveguide-grating system fabricated upon a highly reflecting dielectric stack and isolated by a thick buffer layer. This single-leakage-channel grating coupler utilized the reflectance of the dielectric stack to redirect the light output coupled toward the substrate back into air, where it constructively interfered with light initially output coupled into air. Measured branching ratios were compared with values predicted by a rigorous computer model and agreed to within 2%. Experimental branching ratio values exceeding 98% were obtained.

© 1993 Optical Society of America

Original Manuscript: July 9, 1993
Published: November 15, 1993

Ronald L. Roncone, John C. Brazas, and Lifeng Li, "Single-leakage-channel grating couplers: comparison of theoretical and experimental branching ratios," Opt. Lett. 18, 1919-1921 (1993)

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  1. R. L. Roncone, L. Li, K. A. Bates, J. J. Burke, L. Weisenbach, B. J. J. Zelinski, Appl. Opt. 32, 4522 (1993). [CrossRef] [PubMed]
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  8. The stacks were fabricated by Evaporated Coatings, Inc., 2365 Maryland Road, Willow Grove, Pa. 19090.
  9. J. C. Brazas, J. Imag. Sci. 32, 56 (1988).

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