Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 34, Issue 3, Pages 969-977Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2016.2516758
Keywords
Biosensor; directional coupler; near infrared; photonic circuit; ring resonator; silicon oxynitride; waveguide
Funding
- EU [610580]
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In this paper, we report on the design, fabrication, and characterization of a photonic circuit for biosensing applications. Silicon oxynitride with a bulk refractive index of 1.66 is the core-layer material. The photonic circuit is optimized for a wavelength of similar to 850 nm, which allows on-chip integration of the light source via cost effective vertical-cavity surface-emitting lasers and of the detector by using standard silicon photodetectors. Design as well as fabrication processes are explained in details. The best characteristics for the single optical components in the photonic circuit are: for single-mode channel waveguides with dimensions of 350 nm x 950 nm; propagation losses of 0.8 dB/cm; bending losses of 0.1 dB/90 degrees-bend (radius of curvature 100 mu m); 49/51 splitting ratio for 3-dB power splitters (directional couplers); quality factors up to 1.3 x 105 for microring resonators. Volumetric sensing yields a bulk sensitivity of 80 nm/RIU and a limit of detection of 3 x 10-6 RIU. Therefore, SiON-based photonic circuits represent a reliable material platform for biosensing in the short-wave near infrared region.
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