Subwavelength grating periodic structures in silicon-on-insulator : A new type of microphotonic waveguide

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DOIResolve DOI: http://doi.org/10.1364/OE.18.020251
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TypeArticle
Journal titleOptics Express
Volume18
Issue19
Pages2025120262; # of pages: 12
AbstractWe report on the experimental demonstration and analysis of a new waveguide principle using subwavelength gratings. Unlike other periodic waveguides such as line-defects in a 2D photonic crystal lattice, a subwavelength grating waveguide confines the light as a conventional index-guided structure and does not exhibit optically resonant behaviour. Subwavelength grating waveguides in silicon-on-insulator are fabricated with a single etch step and allow for flexible control of the effective refractive index of the waveguide core simply by lithographic patterning. Experimental measurements indicate a propagation loss as low as 2.1 dB/cm for subwavelength grating waveguides with negligible polarization and wavelength dependent loss, which compares favourably to conventional microphotonic silicon waveguides. The measured group index is nearly constant ng ~1.5 over a wavelength range exceeding the telecom C-band.
Publication date
LanguageEnglish
AffiliationNRC Institute for Microstructural Sciences; NRC Genomics and Health Initiative; National Research Council Canada
Peer reviewedYes
NPARC number17326680
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Record identifier32d4e095-aaa8-47f7-874a-d6ec05d1b9af
Record created2011-03-26
Record modified2016-05-09
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