An ultra-sensitive biosensor based on surface plasmon resonance and weak value amplification

• Published in: Frontiers in chemistry Vol. 12; p. 1382251
• Main Authors: Zhang, Lizhong, He, Mingyi, Xu, Yang, Guo, Cuixia, Zhou, Chongqi, Guan, Tian
• Format: Journal Article
• Language: English
• Published: Switzerland Frontiers Media S.A 2024
• Subjects: biomolecular interaction; biosensor; refractive index sensor; surface plasmon resonance; weak value amplification; weak value amplification; biosensor; biomolecular interaction; surface plasmon resonance; refractive index sensor
• ISSN: 2296-2646; 2296-2646
• DOI: 10.3389/fchem.2024.1382251

An ultra-sensitive phase plasmonic sensor combined with weak value amplification is proposed for the detection of IgG, as a model analyte. Phase detection is accomplished by self-interference between the p-polarization and the s-polarization of the light. With the principles of weak value amplification, a phase compensator is used to modulate the coupling strength and enhance the refractive index sensitivity of the system. On a simple Au-coated prism-coupled surface plasmon resonance (SPR) structure, the scheme, called WMSPR, achieves a refractive index sensitivity of 4.737 × 10
nm/RIU, which is about three times higher than that of the conventional phase-based approach. The proposed WMSPR biosensor gives great characteristics with a high resolution of 6.333 × 10
RIU and a low limit of detection (LOD) of 5.3 ng/mL. The results yield a great scope to promote the optimization of other SPR biosensors for high sensitivity.