Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/83935
Title: Ultrasensitive optical microfiber coupler based sensors operating near the turning point of effective group index difference
Authors: Zhang, Nan
Li, Kaiwei
Zhang, Ting
Liu, Guigen
Zhang, Mengying
Wei, Lei
Keywords: Polarization
Optical sensors
Issue Date: 2016
Source: Li, K., Zhang, T., Liu, G., Zhang, N., Zhang, M., & Wei, L. (2016). Ultrasensitive optical microfiber coupler based sensors operating near the turning point of effective group index difference. Applied Physics Letters, 109(10), 101101-.
Series/Report no.: Applied Physics Letters
Abstract: We propose and study an optical microfiber coupler (OMC) sensor working near the turning point of effective group index difference between the even supermode and odd supermode to achieve high refractive index (RI) sensitivity. Theoretical calculations reveal that infinite sensitivity can be obtained when the measured RI is close to the turning point value. This diameter-dependent turning point corresponds to the condition that the effective group index difference equals zero. To validate our proposed sensing mechanism, we experimentally demonstrate an ultrahigh sensitivity of 39541.7 nm/RIU at a low ambient RI of 1.3334 based on an OMC with the diameter of 1.4 μm. An even higher sensitivity can be achieved by carrying out the measurements at RI closer to the turning point. The resulting ultrasensitive RI sensing platform offers a substantial impact on a variety of applications from high performance trace analyte detection to small molecule sensing.
URI: https://hdl.handle.net/10356/83935
http://hdl.handle.net/10220/42881
ISSN: 0003-6951
DOI: 10.1063/1.4961981
Rights: © 2016 American Institute of Physics (AIP). This paper was published in Applied Physics Letters and is made available as an electronic reprint (preprint) with permission of American Institute of Physics (AIP). The published version is available at: [http://dx.doi.org/10.1063/1.4961981]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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