期刊
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
卷 25, 期 3, 页码 -出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSTQE.2018.2821842
关键词
High sensitivity; sub-wavelength; multi-box; microring resonator; label-free biosensor
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- NSERC CREATE Silicon Electronic Photonic Integrated Circuits Research Training Program
- MITACS Accelerate program
- Government of Canada's Business-Led Networks of Centres of Excellence Refined Manufacturing Acceleration Process program
- China Scholarship Council
In this paper, a novel silicon photonic waveguide for a high sensitivity label-free sensor is presented. We use silicon-on-insulator subwavelength waveguides that consist of five rows of periodic silicon squares with 60 nm gap distances between each square (multibox structure) to construct microring resonators to achieve higher bulk and surface sensitivities than the resonators using conventional strip waveguides. Due to the high surface contact area and low optical confinement of the proposed multibox waveguides, the sensitivity of the microring resonator can be significantly increased. By exposing the multibox microring resonators to ultrapure water and different concentrations of isopropyl alcohol solution, we show a bulk sensitivity of 579.5 nm/RIU, which is an increase compared to recently published subwavelength grating waveguides and strip waveguides in transverse magnetic polarization microring resonators. Finally, a standard biological sandwich assay is employed to demonstrate the multibox sensor's ability, with an enhanced surface sensitivity of 1900 pm/nm.
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