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Proceedings Paper

Applications of subwavelength grating structures in silicon-on-insulator waveguides
Author(s): Jens H. Schmid; Przemek J. Bock; Pavel Cheben; William Sinclair; Jaime García; Siegfried Janz; Jean Lapointe; Geoffrey C. Aers; Daniel Poitras; Yunhui Li; Gregory Lopinski; André Delâge; Adam Densmore; Boris Lamontagne; Rubin Ma; Dan-Xia Xu
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Paper Abstract

We 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 μm 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.

Paper Details

Date Published: 16 February 2010
PDF: 9 pages
Proc. SPIE 7606, Silicon Photonics V, 76060F (16 February 2010); doi: 10.1117/12.841022
Show Author Affiliations
Jens H. Schmid, National Research Council Canada (Canada)
Przemek J. Bock, National Research Council Canada (Canada)
Univ. of Ottawa (Canada)
Pavel Cheben, National Research Council Canada (Canada)
William Sinclair, National Research Council Canada (Canada)
Jaime García, Univ. Politécnica de Valencia (Spain)
Siegfried Janz, National Research Council Canada (Canada)
Jean Lapointe, National Research Council Canada (Canada)
Geoffrey C. Aers, National Research Council Canada (Canada)
Daniel Poitras, National Research Council Canada (Canada)
Yunhui Li, National Research Council Canada (Canada)
Gregory Lopinski, National Research Council Canada (Canada)
André Delâge, National Research Council Canada (Canada)
Adam Densmore, National Research Council Canada (Canada)
Boris Lamontagne, National Research Council Canada (Canada)
Rubin Ma, National Research Council Canada (Canada)
Dan-Xia Xu, National Research Council Canada (Canada)


Published in SPIE Proceedings Vol. 7606:
Silicon Photonics V
Joel A. Kubby; Graham T. Reed, Editor(s)

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