dc.contributor.authorXu, Zhilin
dc.contributor.authorLuo, Yiyang
dc.contributor.authorLiu, Deming
dc.contributor.authorShum, Perry Ping
dc.contributor.authorSun, Qizhen
dc.identifier.citationXu, Z., Luo, Y., Liu, D., Shum, P. P., & Sun, Q. (2017). Sensitivity-controllable refractive index sensor based on reflective θ-shaped microfiber resonator cooperated with Vernier effect. Scientific Reports, 7, 9620-. doi:10.1038/s41598-017-10163-xen_US
dc.description.abstractIn this paper, we report a sensitivity-controllable refractive index (RI) sensor based on a reflective θ-shaped microfiber resonator cooperated with Vernier effect. The θ-shaped microfiber resonator is a reflective all-fiber device with comb spectrum under weak coupling condition. By cascading it with a fiber Fabry-Perot interferometer, Vernier effect is generated to demodulate surrounding RI with enhanced sensitivity. Theoretical analysis reveals that RI sensitivity of the combined structure with Vernier effect is m times higher than the sensitivity of singular θ-shaped microfiber resonator. Moreover, by adjusting cavity length of the θ-shaped microfiber resonator, magnification factor M = (m + 1) can be tuned which enables the RI sensitivity to be controlled. Experimental result demonstrates that the RI sensitivity can be widely tuned from 311.77 nm/RIU (Reflective index unit) to 2460.07 nm/RIU when the cavity length of the θ-shaped microfiber resonator is adjusted from 9.4 mm to 8.7 mm. The θ-shaped microfiber resonator based all-fiber RI sensor featuring controllable sensitivity and compact size can be widely used for chemical and biological detections. The proposed scheme of generating Vernier effect also offers a universal idea to increase measurement sensitivity for optical fiber sensing structures with comb spectrum.en_US
dc.description.sponsorshipMOE (Min. of Education, S’pore)en_US
dc.format.extent8 p.en_US
dc.relation.ispartofseriesScientific Reportsen_US
dc.rights© 2017 The Author(s). This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Te images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.en_US
dc.subjectVernier Effecten_US
dc.subjectControllable Sensitivityen_US
dc.subjectDRNTU::Engineering::Electrical and electronic engineeringen_US
dc.titleSensitivity-controllable refractive index sensor based on reflective θ-shaped microfiber resonator cooperated with Vernier effecten_US
dc.typeJournal Article
dc.contributor.researchCNRS International NTU THALES Research Alliancesen_US
dc.contributor.schoolSchool of Electrical and Electronic Engineeringen_US
dc.description.versionPublished versionen_US

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