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Sub-wavelength multi-box waveguide-based label-free sensors
Author(s): Enxiao Luan; Han Yun; Loic Laplatine; Jonas Flueckiger; Yonathan Dattner; Daniel Ratner; Karen Cheung; Lukas Chrostowski
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Paper Abstract

Novel sub-wavelength silicon photonic waveguides for label-free sensors are demonstrated in this article. We use silicon-on-insulator (SOI) waveguides that consist of sub-wavelength grating (SWG) structures, where the waveguides are made of small silicon arrays (180 × 180 nm2 rectangles with 60 nm gaps). They are used to form microring and Bragg grating resonators which measure the change of refractive index by monitoring the resonant wavelength shift. Due to the high surface contact area and low optical confinement of the proposed waveguide, the sensitivity (both bulk and surface) can be significantly increased. The bulk sensitivity of 580 nm/RIU for the microring and 610 nm/RIU for the Bragg grating are better than other recently published resonator sensors. Moreover, a standard biological sandwich assay demonstrates an enhanced surface sensitivity of 2050 pm/nm for both devices. Theoretical models and experimental results are investigated, indicating the predominant losses are from the water absorption at 1550 nm and scattering by sidewall roughness.

Paper Details

Date Published: 23 February 2018
PDF: 13 pages
Proc. SPIE 10535, Integrated Optics: Devices, Materials, and Technologies XXII, 105350H (23 February 2018); doi: 10.1117/12.2287621
Show Author Affiliations
Enxiao Luan, The Univ. of British Columbia (Canada)
Han Yun, The Univ. of British Columbia (Canada)
Loic Laplatine, The Univ. of British Columbia (Canada)
Jonas Flueckiger, SiDx (United States)
Yonathan Dattner, Luxmux Technology Corp. (Canada)
Daniel Ratner, Univ. of Washington (United States)
Karen Cheung, The Univ. of British Columbia (Canada)
Lukas Chrostowski, The Univ. of British Columbia (Canada)


Published in SPIE Proceedings Vol. 10535:
Integrated Optics: Devices, Materials, and Technologies XXII
Sonia M. García-Blanco; Pavel Cheben, Editor(s)

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