Surface plasmon resonance sensor composed of a D-type photonic crystal fiber with a three-layer coating

Author:

Liu Qiang,Wang Shimiao,Mu Haiwei,Sun Yudan1,Zhao Jin,Wang Kaiyu,Liu Wei,Lv Jingwei,Chu Paul K.2,Liu Chao

Affiliation:

1. Daqing Normal University

2. City University of Hong Kong

Abstract

A surface plasmon resonance sensor composed of photonic crystal fibers (PCF-SPR) with an Au-TiO2-Au triple layer is designed for refractive index (RI) sensing and analyzed theoretically by the finite element method. The sensor exhibits enhanced resonance coupling between the core mode and surface plasmon polariton (SPP) mode as well as better sensitivity than the structure with a single gold coating. Furthermore, the Au-TiO2-Au tri-layer structure narrows the linewidth of the loss spectrum and improves the figure of merit (FOM). In the analyte RI range of 1.30–1.42, the maximum wavelength sensitivity is 20,300 nm/RIU, resolution is 4.93×10−6, amplitude sensitivity is 6427RIU−1, and FOM is 559RIU−1. The results provide insights into the design of high-performance PCF-SPR sensors.

Funder

City University of Hong Kong

Natural Science Foundation of Heilongjiang Province

China Postdoctoral Science Foundation

Northeast Petroleum University

Hainan Provincial Department of Science and Technology

Publisher

Optica Publishing Group

Subject

Computer Vision and Pattern Recognition,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials

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