Journal
BIOSENSORS & BIOELECTRONICS
Volume 80, Issue -, Pages 682-690Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2016.01.051
Keywords
Biosensor; Nanophotonics; Sensor Optimization; Noise; Glycoprotein
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Funding
- National Science Foundation
- Defense Advanced Research Projects Agency (DARPA) [HR 0011-10-1-0075]
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We present the systematic design, fabrication, and characterization of a multiplexed label-free lab-on-a chip biosensor using silicon nitride (SiN) microring resonators. Sensor design is addressed through a systematic approach that enables optimizing the sensor according to the specific noise characteristics of the setup. We find that an optimal 6 dB undercoupled resonator consumes 40% less power in our platform to achieve the same limit-of-detection as the conventional designs using critically coupled resonators that have the maximum light-matter interaction. We lay out an optimization framework that enables the generalization of our method for any type of optical resonator and noise characteristics. The device is fabricated using a CMOS-compatible process, and an efficient swabbing lift-off technique is introduced for the deposition of the protective oxide layer. This technique increases the lift-off quality and yield compared to common lift-off methods based on agitation. The complete sensor system, including microfluidic flow cell and surface functionalization with glycan receptors, is tested for the multiplexed detection of Aleuria Aurantia Lectin (AAL) and Sambucus Nigra Lectin (SNA). Further analysis shows that the sensor limit of detection is 2 x 10(-6) RIU for bulk refractive index, 1 pg/mm(2) for surface-adsorbed mass, and similar to 10 pM for the glycan/lectins studied here. (C) 2016 Elsevier B.V. All rights reserved.
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