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Metal Nanowire Assisted Hollow Core Fiber Sensor for an Efficient Detection of Small Refractive Index Change of Measurand Liquid

Pathak, A. K., Ghosh, S. ORCID: 0000-0002-1992-2289, Gangwar, R. K., Rahman, B. M. A. ORCID: 0000-0001-6384-0961 and Singh, V. (2019). Metal Nanowire Assisted Hollow Core Fiber Sensor for an Efficient Detection of Small Refractive Index Change of Measurand Liquid. Plasmonics, doi: 10.1007/s11468-019-00969-y

Abstract

In this article, a cost-effective hollow core fiber (HCF)-based refractive index (RI) sensor using surface plasmon resonance (SPR) is designed and demonstrated. The sensor consists of a metal nanowire inside an HCF along with the sensing medium of various refractive indices. SPR effect between polaritons and the guided core mode of designed HCF is exploited to enhance the sensing performance. A full vectorial finite element method (FEM) is used for the design and analyses of the sensing probes which exhibit very high sensitivities of 12,400 nm/RIU, 10560 nm/RIU, and 6400 nm/RIU for copper (Cu), gold (Au), and silver (Ag), respectively with a resolution of 1.61 × 10−6 RIU. Additionally, the influence of metal wire dimension is also investigated in this paper. The reported simple and low-cost sensor exhibits high sensitivity for liquid with refractive indices slightly higher than that of the dielectric tube, such as olive oil, turpentine, kerosene, chloroform, carbon tetrachloride, glycerol, and toluene.

Publication Type: Article
Additional Information: This is a post-peer-review, pre-copyedit version of an article published in Plasmonics. The final authenticated version is available online at: https://doi.org/10.1007/s11468-019-00969-y.
Publisher Keywords: hollow core fiber; refractive index sensor; surface plasmon resonance; nanowire; sensitivity
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Departments: School of Mathematics, Computer Science & Engineering > Engineering > Electrical & Electronic Engineering
URI: http://openaccess.city.ac.uk/id/eprint/22615
[img] Text - Accepted Version
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