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dc.contributor.authorLi, Kaiweien
dc.contributor.authorZhang, Nanen
dc.contributor.authorZhang, Nancy Meng Yingen
dc.contributor.authorLiu, Guigenen
dc.contributor.authorZhang, Tingen
dc.contributor.authorWei, Leien
dc.identifier.citationLi, K., Zhang, N., Zhang, N. M. Y., Liu, G., Zhang, T., & Wei, L. (2018). Ultrasensitive measurement of gas refractive index using an optical nanofiber coupler. Optics Letters, 43(4), 679-682. doi:10.1364/OL.43.000679en
dc.description.abstractWe report an ultrasensitive gas refractive index (RI) sensor based on optical nanofiber couplers (ONCs). Theoretical analysis reveals that a dispersion turning point (DTP) exists when the diameter of the coupler is below 1000 nm. Leveraging this DTP, the gas RI sensitivity can be significantly improved to infinity. Then we experimentally demonstrate a DTP and achieve ultrahigh sensitivities of 46,470  nm/refractive index unit (RIU) and −45,550  nm/RIU around the DTP using an ONC with a diameter of 700 nm. More importantly, the unique twin dips/peaks interference characteristics around the DTP offers further enhancement on the sensitivity to 92,020  nm/RIU. The demonstrated sensor not only shows vast potential in ultrasensitive pressure sensing, acoustic sensing, gas sensing, and gas phase biomarker detection, but also provides a new tool for nonlinear optics, ultrafast optics, quantum optics, and ultracold atom optics.en
dc.description.sponsorshipMOE (Min. of Education, S’pore)en
dc.format.extent4 p.en
dc.relation.ispartofseriesOptics Lettersen
dc.rights© 2018 Optical Society of America. All rights reserved. This paper was published in Optics Letters and is made available with permission of Optical Society of America.en
dc.subjectFiber Opticsen
dc.subjectFiber Optics Sensorsen
dc.subjectDRNTU::Engineering::Electrical and electronic engineeringen
dc.titleUltrasensitive measurement of gas refractive index using an optical nanofiber coupleren
dc.typeJournal Articleen
dc.contributor.schoolSchool of Electrical and Electronic Engineeringen
dc.contributor.organizationCINTRA CNRS/NTU/THALESen
dc.contributor.researchResearch Techno Plazaen
dc.description.versionAccepted versionen
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