High-performance surface plasmon resonance refractometer based on a no-core fiber coated with a silver film

• DOI: 10.1364/josab.433055
• Publication Date: 2021-07-15T12:30:13Z
• Authors: Yundong Liu; Hailiang Chen; Hongyu Li; Song Zhang; Zhigang Gao; Yuhui Feng; Yingyue Zhang; Shuguang Li
• Keywords: Refractometer

Owing to their high sensitivity, surface plasmon resonance (SPR)-based sensors depict broad application prospects in biochemical detection, environmental monitoring, and food safety. In this paper, an optical fiber-based SPR sensor is proposed demonstrated for the refractive index (RI) detection of liquid samples. This composed a multimode fiber (MMF), no-core (NCF), another MMF that connected sequence. The length NCF 2 cm. A thin silver film deposited on stimulate effect. Experimental results indicated shift amount dip wavelength as 303.6 nm RI increases from 1.333 1.4107. sensitivity 2507.58 nm/RIU with fitting linearity <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:msup> <mml:mi>R</mml:mi> <mml:mn>2</mml:mn> </mml:msup> </mml:mrow> </mml:math> 0.9931 obtained lower region 1.333–1.3723, while reaches 5228.21 0.97395, respectively, higher 1.3723–1.4107. Compared previously reported sensors, optic exhibits advantages simple structure, small volume, low cost, wide range.