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dc.contributor.authorLi, Kaiweien
dc.contributor.authorZhang, Nanen
dc.contributor.authorZhang, Nancy Meng Yingen
dc.contributor.authorZhou, Wenchaoen
dc.contributor.authorZhang, Tingen
dc.contributor.authorChen, Mingen
dc.contributor.authorWei, Leien
dc.identifier.citationLi, K., Zhang, N., Zhang, N. M. Y., Zhou, W., Zhang, T., Chen, M., & Wei, L. (2018). Birefringence induced Vernier effect in optical fiber modal interferometers for enhanced sensing. Sensors and Actuators B: Chemical, 27516-24. doi:10.1016/j.snb.2018.08.027en
dc.description.abstractWe report a simple and effective method to improve the sensitivities of fiber-optic modal interferometers with birefringence induced Vernier effect. Taking optical microfiber coupler as an example, we study the sensitivity enhancement of a microfiber coupler for refractive index (RI) sensing both theoretically and experimentally in the RI range of 1.33–1.35 where bioassays are typically carried out. Numerical results show that by tracing the wavelength shifts of dips in the envelope formed by the Vernier effect, RI sensitivities can be improved by almost one order of magnitude compared to the sensors without the Vernier effect. Then we experimentally achieve an ultra-high sensitivity of 35,823.3 nm/RIU using a microfiber coupler with a width of 3.2 μm. More importantly, we apply this ultra-sensitive sensor to detect human cardiac troponin, and a limit of detection of 1 ng/mL is achieved. This sensor is simple in configuration andcan serve as a bio-photonic platform for clinical diagnostics environmental monitoring and food safety.en
dc.description.sponsorshipMOE (Min. of Education, S’pore)en
dc.format.extent16 p.en
dc.relation.ispartofseriesSensors and Actuators B: Chemicalen
dc.rights© 2018 Elsevier. All rights reserved. This paper was published in Sensors and Actuators B: Chemical and is made available with permission of Elsevier.en
dc.subjectEngineering::Electrical and electronic engineeringen
dc.subjectOptical Fiber Sensorsen
dc.subjectOptical Microfiber Couplersen
dc.titleBirefringence induced Vernier effect in optical fiber modal interferometers for enhanced sensingen
dc.typeJournal Articleen
dc.contributor.schoolSchool of Electrical and Electronic Engineeringen
dc.contributor.researchResearch Techno Plazaen
dc.description.versionAccepted versionen
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