Applications of subwavelength grating structures in silicon-on-insulator waveguides

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Proceedings titleProceedings of SPIE
ConferenceSilicon Photonics V, January 24-27, 2010, San Francisco, California, USA
Subjectsubwavelength gratings; silicon-on-insulator; silicon photonics; photonic wire; guided mode resonance; effective medium; fiber-chip coupling; waveguide crossing
AbstractWe discuss several applications of both resonant and non-resonant subwavelength gratings (SWGs) for silicon photonics. We present results of evanescent field molecular sensing using the transverse magnetic mode of a 0.22 mm thick silicon slab waveguide with a resonant SWG, which couples a free space laser beam to the silicon waveguide mode. The optical readout of this configuration is almost identical to the established surface plasmon resonance sensing technology. Using calibrated sucrose solutions, we demonstrate a bulk refractive index sensitivity of 111 nm/RIU in good agreement with rigorous coupled wave analysis calculations. The binding of a monolayer of streptavidin protein on the waveguide surface is monitored in real time with a signal-to-noise ratio of ~500. In another application, non-resonant SWGs are used to create effective dielectric media with a refractive index that can be tuned between the values of silicon (3.48) and SU-8 polymer used for the cladding (1.58). For example, we present SWG waveguides with an effective core index of approximately 2.65, which exhibit lower propagation loss than photonic wire waveguides of similar dimensions. We use these SWG waveguides to demonstrate highly efficient fiber-chip couplers.
Publication date
AffiliationNRC Genomics and Health Initiative; NRC Institute for Microstructural Sciences; National Research Council Canada; NRC Steacie Institute for Molecular Sciences
Peer reviewedNo
NPARC number16885302
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Record identifier5a748315-86b1-486d-90eb-4158a05969da
Record created2011-03-29
Record modified2016-05-09
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