Refractive index engineering with subwavelength gratings for efficient microphotonic couplers and planar waveguide multiplexers

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DOIResolve DOI: http://doi.org/10.1364/OL.35.002526
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TypeArticle
Journal titleOptics Letters
Volume35
Issue15
Pages25262528; # of pages: 3
AbstractWe use subwavelength gratings (SWGs) to engineer the refractive index in microphotonic waveguides, including practical components such as input couplers and multiplexer circuits. This technique allows for direct control of the mode confinement by changing the refractive index of a waveguide core over a range as broad as 1.6–3.5 by lithographic patterning. We demonstrate two experimental examples of refractive index engineering, namely, a microphotonic fiber-chip coupler with a coupling loss as small as ?0:9 dB and minimal wavelength dependence and a planar waveguide multiplexer with SWG nanostructure, which acts as a slab waveguide for light diffracted by the grating, while at the same time acting as a lateral cladding for the strip waveguide. This yields an operation bandwidth of 170 nm for a device size of only ~160 ?m × 100 ?m.
Publication date
LanguageEnglish
AffiliationNRC Institute for Microstructural Sciences; NRC Genomics and Health Initiative; National Research Council Canada
Peer reviewedYes
NPARC number17355697
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Record identifierc4ed2c4b-1ed8-4a69-9b2e-d595ebe6422a
Record created2011-03-22
Record modified2016-05-09
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