A Hi-Bi Ultra-Sensitive Surface Plasmon Resonance Fiber Sensor

IEEE Access

Rajib Ahmed¹  Cristiano M. B. Cordeiro²  Rifat Ahmmed Aoni³  Shilun Feng⁴  Alex Dinovitser⁵  Brian Wai-Him Ng⁵  Derek Abbott⁵  Jakeya Sultana⁵  Mohsen Dorraki⁵  Md. Saiful Islam⁵ 

[1] Bio-Acoustic MEMS in Medicine (BAMM) Laboratory, School of Medicine, Stanford University, Palo Alto, CA, USA;Institute for Photonics and Advanced Sensing (IPAS), The University of Adelaide, Adelaide, SA, Australia;Nonlinear Physics Centre, Research School of Physics and Engineering, The Australian National University, Canberra, ACT, Australia;School of Biomedical Engineering, Faculty of Science and Engineering, Macquarie University, NSW, Australia;School of Electrical and Electronic Engineering, The University of Adelaide, Adelaide, SA, Australia;

关键词: Surface plasmons;    polarization;    birefringence;    resonance;    plasmonics;    optical sensing;   

DOI  :  10.1109/ACCESS.2019.2922663

来源: DOAJ

【 摘 要 】

In this paper, a simple, miniature, and highly sensitive photonic crystal fiber (PCF)-based surface plasmon resonance (SPR) sensor is proposed. The target analyte and the plasmonic material are at the outer surface of the fiber making practical applications feasible. A 30-nm gold (Au) layer supports surface plasmons. A thin titanium dioxide (TiO₂) layer is used to assist adhesion of Au on the glass fiber. The fiber cross section is formed purely by circular-shaped holes simplifying the preform manufacturing process. A high-birefringence (hi-bi) fiber is obtained by means of an array of air holes at the center of the fiber. A finite element method (FEM) is employed to analyze the surface plasmon properties of the proposed PCF-SPR sensor. By optimizing the geometric parameters, a maximum wavelength sensitivity (WS) of 25 000 nm/RIU and an amplitude sensitivity (AS) of 1411 RIU^-1 for a dielectric refractive index (RI) range of 1.33-1.38 are obtained. Moreover, an estimated maximum resolution of 4 × 10^-6 and a figure of merit (FOM) of 502 are obtained that ensures high detection accuracy of small refractive index (RI) changes. Owing to its sensitivity and simple architecture, the proposed sensor has potential application in a range of sensing application, including biosensing.

【 授权许可】

Unknown