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

Zhilin Xu, Qizhen Sun, Borui Li, Yiyang Luo, Wengao Lu, Deming Liu, Perry Ping Shum, Lin Zhang

Research output: Contribution to journalArticle

Abstract

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
Original languageEnglish
Pages (from-to)6662-6672
Number of pages11
JournalOptics Express
Volume23
Issue number5
Early online date3 Mar 2015
DOIs
Publication statusPublished - 9 Mar 2015

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