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

Open access
Cheben, Pavel, Bock, Przemek J., Schmid, Jens H., Lapointe, Jean, Janz, Siegfried, Xu, Dan-Xia, Densmore, Adam, Delâge, André, Lamontagne, Boris, Hall, Trevor J.·2010·Optics Letters

Abstract

We 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 -0.9dB 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 170nm for a device size of only approximately 160microm x100microm.

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Metadata

Authors
Cheben, P., Bock, P. J., Schmid, J. H., Lapointe, J., Janz, S., Xu, D.-X., Densmore, A., Delâge, A., Lamontagne, B., & Hall, T. J.
Venue
Optics Letters
Published
2010-07-20
Volume
35
Issue
15
Pages
2526
ISSN
  • 0146-9592 (ISSN-L)
  • 1539-4794
OpenAlex
W1985508001
Cited by
298
References
5
FWCI
12.21
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Refractive index engineering with subwavelength gratings for efficient microphotonic couplers and planar waveguide multiplexers. https://app.cochat.ai/papers/10.1364/ol.35.002526
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Cheben, P., Bock, P. J., Schmid, J. H., Lapointe, J., Janz, S., Xu, D.-X., Densmore, A., Delâge, A., Lamontagne, B., & Hall, T. J. (2010). Refractive index engineering with subwavelength gratings for efficient microphotonic couplers and planar waveguide multiplexers. Optics Letters. https://doi.org/10.1364/ol.35.002526

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