A Highly Sensitive SPR Sensors Based on Two Parallel PCFs for Low Refractive Index Detection

• Published in: IEEE photonics journal Vol. 10; no. 4; pp. 1 - 10
• Main Authors: Wang, Famei, Liu, Chao, Sun, Zhijie, Sun, Tao, Liu, Banghua, Chu, Paul K.
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 01.08.2018; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Coupled modes; Crystal fibers; Crystal structure; Gold; Inspection; lower RI detection; near-infrared; Optical fiber sensors; Optical fibers; parallel fiber; PCF-SPR; Pharmaceuticals; Photonic crystals; Plasmons; Power transfer; Refractivity; Sensitivity; Spectral sensitivity
• ISSN: 1943-0655; 1943-0647
• DOI: 10.1109/JPHOT.2018.2856273

Based on two parallel photonic crystal fibers (PCFs) with D-shape structure, a novel surface plasmon resonance (SPR) sensor with low refractive index (RI) detection at near-infrared wavelengths is described. According to the coupled-mode theory, directional power transfer between the two fiber cores is enhanced by resonant coupling between the surface plasmon modes and fiber core-guided modes. In comparison with corresponding single D-shape PCF, a maximum spectral sensitivity up to 13 500 nm/RIU and resolution of 7.41 × 10 -6 RIU for RI detection range between 1.27 and 1.32 are achieved. The proposed two parallel D-shape PCFs-SPR sensor with lower RI detection range offer large potential in the fields of pharmaceutical inspection and pharmaceutical leakage monitoring.