Publication:
Narrowband Bragg filters based on subwavelength grating waveguides for silicon photonic sensing

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2020-12-02

Authors

Pérez-Armenta, Carlos
Ortega-Moñux, Alejandro
Ctyroký, Jirí
Cheben, Pavel
Schmid, Jens H.
Halir, Robert
Molina-Fernández, Íñigo
Wangüemert-Pérez, J. Gonzalo

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Optica Publishing Group
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Abstract

Subwavelength grating (SWG) waveguides have been shown to provide enhanced light-matter interaction resulting in superior sensitivity in integrated photonics sensors. Narrowband integrated optical filters can be made by combining SWG waveguides with evanescently coupled Bragg gratings. In this paper, we assess the sensing capabilities of this novel filtering component with rigorous electromagnetic simulations. Our design is optimized for an operating wavelength of 1310 nm to benefit from lower water absorption and achieve narrower bandwidths than at the conventional wavelength of 1550 nm. Results show that the sensor achieves a sensitivity of 507 nm/RIU and a quality factor of 4.9 × 104, over a large dynamic range circumventing the free spectral range limit of conventional devices. Furthermore, the intrinsic limit of detection, 5.1 × 10-5 RIU constitutes a 10-fold enhancement compared to state-of-the-art resonant waveguide sensors.

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Medical Subject Headings::Technology and Food and Beverages::Technology, Industry, and Agriculture::Engineering::Optics and Photonics
Medical Subject Headings::Phenomena and Processes::Physical Phenomena::Magnetic Phenomena::Electromagnetic Phenomena
Medical Subject Headings::Technology and Food and Beverages::Technology, Industry, and Agriculture::Manufactured Materials::Biomedical and Dental Materials::Polymers::Siloxanes::Silicones
Medical Subject Headings::Disciplines and Occupations::Natural Science Disciplines::Science::Research
Medical Subject Headings::Technology and Food and Beverages::Technology, Industry, and Agriculture::Technology
Medical Subject Headings::Analytical, Diagnostic and Therapeutic Techniques and Equipment::Equipment and Supplies::Electrical Equipment and Supplies::Micro-Electrical-Mechanical Systems::Lab-On-A-Chip Devices
Medical Subject Headings::Analytical, Diagnostic and Therapeutic Techniques and Equipment::Investigative Techniques::Optical Imaging::Narrow Band Imaging

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Optics and photonics, Lab-on-a-chip devices, Technological development, Narrow band imaging, Óptica y fotónica, Dispositivos laboratorio en un chip, Desarrollo tecnológico, Imagen de banda estrecha

Citation

Pérez-Armenta C, Ortega-Moñux A, Ctyroký J, Cheben P, Schmid JH, Halir R, et al. Narrowband Bragg filters based on subwavelength grating waveguides for silicon photonic sensing. Opt Express. 2020 Dec 7;28(25):37971-37985.