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Title: Ultrasensitive measurement of gas refractive index using an optical nanofiber coupler
Authors: Li, Kaiwei
Zhang, Nan
Zhang, Nancy Meng Ying
Liu, Guigen
Zhang, Ting
Wei, Lei
Keywords: Fiber Optics
Fiber Optics Sensors
DRNTU::Engineering::Electrical and electronic engineering
Issue Date: 2018
Source: Li, 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.43.000679
Series/Report no.: Optics Letters
Abstract: We 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.
ISSN: 0146-9592
DOI: 10.1364/OL.43.000679
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.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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