Waveguide grating coupler with subwavelength microstructures
Optics Letters, Vol. 34, Issue 9, pp. 1408-1410 (2009)
http://dx.doi.org/10.1364/OL.34.001408
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Abstract
We propose a silicon waveguide-fiber grating coupler that uses a subwavelength microstructure to achieve a continuously variable grating strength yet can be fabricated using only a single etch step. By adjusting the subwavelength microstructure at every point along the grating, the grating coupler can be optimized to give high field overlap with the optical fiber mode and also minimize backreflections along the incident waveguide path. Our design example is optimized for quasi-TM mode in a silicon photonic-wire waveguide, as required for waveguide evanescent-field-sensing applications. A field overlap of up to 94% with a standard single-mode optical fiber (SMF-28) is achieved by coupler apodization. Backreflection from the grating is reduced to
© 2009 Optical Society of America
OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(130.0130) Integrated optics : Integrated optics
(050.6624) Diffraction and gratings : Subwavelength structures
ToC Category:
Diffraction and Gratings
History
Original Manuscript: February 9, 2009
Revised Manuscript: April 1, 2009
Manuscript Accepted: April 4, 2009
Published: April 24, 2009
Citation
Robert Halir, Pavel Cheben, Siegfried Janz, Dan-Xia Xu, Íñigo Molina-Fernández, and Juan G. Wangüemert-Pérez, "Waveguide grating coupler with subwavelength microstructures," Opt. Lett. 34, 1408-1410 (2009)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-34-9-1408
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