dc.contributor.authorLiu, Qing
dc.contributor.authorTu, Xiaoguang
dc.contributor.authorKim, Kyung Woo
dc.contributor.authorKee, Jack Sheng
dc.contributor.authorShin, Yong
dc.contributor.authorHan, Kyungsup
dc.contributor.authorYoon, Yong-Jin
dc.contributor.authorLo, Guo-Qiang
dc.contributor.authorPark, Mi Kyoung
dc.identifier.citationLiu, Q., Tu, X., Kim, K. W., Kee, J. S., Shin, Y., Han, K., et al. (2013). Highly sensitive Mach–Zehnder interferometer biosensor based on silicon nitride slot waveguide. Sensors and Actuators B: Chemical, 188, 681-688.en_US
dc.description.abstractWe demonstrate a highly sensitive label-free Mach–Zehnder interferometer (MZI) biosensor based on silicon nitride slot waveguide. Unlike the conventional MZI sensors, the sensing arm of the sensor consists of a slot waveguide while the reference arm consists of a strip waveguide. Thanks to the slot waveguide's property to provide high optical intensity in a subwavelength-size low refractive index region (slot region), which allows high light–analyte interaction, higher sensitivity can be obtained as compared to conventional waveguides using the slot waveguide as sensing region. The bulk refractive index sensitivity of the slot waveguide MZI sensor was found to be 1864π/RIU (refractive index unit) with 7 mm long slot waveguide sensing arm, which shows higher sensitivity compared to the conventional MZI device based on silicon nitride. The biosensing capability of the developed slot waveguide MZI was investigated using biotin–streptavidin binding as a model system. The sensitivity of the system was demonstrated down to 18.9 fM or 1 pg/ml of streptavidin solution and to the best of our knowledge, it is the best reported experimental value for the limit of detection of a MZI sensor. Furthermore, we investigated the specific detection and quantification of the methylation of DAPK (Death-associated protein kinase) gene, which is a widely used biomarker for human cancers. We have shown that methylation sequences of DAPK gene of various methylation densities (100%, 50%, and 0% of methylation sites) can be quantified and discriminated even at a concentration as low as 1 fmol/μl or 1 nM.en_US
dc.description.sponsorshipASTAR (Agency for Sci., Tech. and Research, S’pore)en_US
dc.format.extent8 p.en_US
dc.relation.ispartofseriesSensors and Actuators B: Chemicalen_US
dc.rights© 2013 Elsevier B.V.en_US
dc.subjectMach–Zehnder interferometeren_US
dc.subjectSilicon nitride waveguideen_US
dc.titleHighly sensitive Mach–Zehnder interferometer biosensor based on silicon nitride slot waveguideen_US
dc.typeJournal Article
dc.contributor.schoolSchool of Mechanical and Aerospace Engineeringen_US

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