Multichannel Fiber Optic SPR Sensors: Realization Methods, Application Status, and Future Prospects

• Published in: Laser & photonics reviews 2022-08, Vol.16 (8), p.n/a
• Main Authors: Zhang, Siqi, Han, Bo, Zhang, Ya‐nan, Liu, Yingxuan, Zheng, Wanlu, Zhao, Yong
• Format: Article
• Language: English
• Subjects: Biomedical materials; Environmental monitoring; fiber optic sensors; Fiber optics; Molecular interactions; multichannel sensors; Physical properties; Public safety; Qualitative analysis; Refractivity; Sensors; surface plasmon resonance
• ISSN: 1863-8880; 1863-8899
• DOI: 10.1002/lpor.202200009

Fiber optic sensors based on surface plasmon resonance (SPR) have demonstrated outstanding performance in biomedical, environmental monitoring, public safety, and other aspects, which provide powerful platforms for qualitative detection and quantitative analysis of molecular interactions. Among them, multichannel fiber optic SPR sensor has become a core tool in parallel detection scenarios due to the superiorities of compensating for nonspecific binding and environmental fluctuations and implementing multianalyte determination. The realization methods of multichannel sensing revolve around fiber microstructures, enhancement by materials, and hybrid fiber. The applications of multichannel fiber optic SPR sensors are demonstrated in sensing of liquid refractive index (RI), RI and temperature, biochemical molecules, and physical parameters. This review thoroughly analyzes and compares the structure, excitation effect, sensing performance, and the advantages and disadvantages of each type of multichannel fiber optic SPR sensor. Even though there are still some challenges, such as insufficient sensing channels and difficulty in fabrication, in their advancement, efforts in multidiscipline including developing high‐performance sensitive films and innovating micro–nano fabrication processes will overcome these bottlenecks. Lastly, the future development directions of multichannel fiber optic SPR sensors from principle, structure, and material aspects are discussed. The realization methods and application status of the multi‐channel fiber optic surface plasmon resonance sensors are reviewed. In particular, the structure, excitation effect, sensing performance, and the advantages and disadvantages of each type of sensor are thoroughly analyzed and compared. Besides, the future development directions from principle, structure, and material aspects are discussed.