Highly sensitive refractive index sensor based on cascaded microfiber knots with Vernier effect


We propose and experimentally demonstrate a refractive index (RI) sensor based on cascaded microfiber knot resonators (CMKRs) with Vernier effect. Deriving from high proportional evanescent field of microfiber and spectrum magnification function of Vernier effect, the RI sensor shows high sensitivity as well as high detection resolution. By using the method named "Drawing-Knotting-Assembling (DKA)", a compact CMKRs is fabricated for experimental demonstration. With the assistance of Lorentz fitting algorithm on the transmission spectrum, sensitivity of 6523nm/RIU and detection resolution up to 1.533 x 10-7 RIU are obtained in the experiment which show good agreement with the numerical simulation. The proposed all-fiber RI sensor with high sensitivity, compact size and low cost can be widely used for chemical and biological detection, as well as the electronic/magnetic field measurement

Publication DOI: https://doi.org/10.1364/OE.23.006662
Divisions: Engineering & Applied Sciences > Aston Institute of Photonics Technology
Engineering & Applied Sciences > Electrical, Electronic & Power Engineering
Uncontrolled Keywords: Atomic and Molecular Physics, and Optics
Full Text Link: https://www.osa ... ri=oe-23-5-6662
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2015-03-09
Published Online Date: 2015-03-03
Accepted Date: 2015-02-24
Submitted Date: 2014-12-15
Authors: Xu, Zhilin
Sun, Qizhen
Li, Borui
Luo, Yiyang
Lu, Wengao
Liu, Deming
Shum, Perry Ping
Zhang, Lin ( 0000-0002-1691-5577)

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