Characteristics of a paired surface plasma waves biosensor

Area of Science:

• Biophotonics
• Biosensing Technology
• Optical Interferometry

Background:

• Surface plasmon resonance (SPR) biosensors are crucial for label-free biomolecular detection.
• Conventional SPR biosensors face limitations in sensitivity and dynamic range.
• Interferometric and non-interferometric techniques have been employed to enhance SPR performance.

Purpose of the Study:

• To introduce and characterize a novel paired surface plasma wave biosensor (PSPWB).
• To demonstrate the high detection sensitivity and large dynamic measurement range of the PSPWB.
• To compare the performance of PSPWB with existing SPR biosensor technologies.

Main Methods:

• Integration of a common-path optical heterodyne interferometer with amplitude-ratio detection.
• Development of a novel paired surface plasma wave biosensor (PSPWB) architecture.
• Real-time monitoring of refractive index changes and biomolecular interactions.

Main Results:

• The PSPWB achieves a detection sensitivity of 10(-7) refractive index unit (RIU) for sucrose-water solutions.
• Sensitivity is further confirmed up to 10(-9) RIU for IgG/anti-IgG interactions.
• A large dynamic measurement range of 10(5) for effective refractive index (Deltan(eff)) was obtained.
• Performance is equivalent to the shot-noise limit of conventional SPR biosensors.

Conclusions:

• The novel PSPWB offers superior detection sensitivity compared to existing SPR biosensors.
• The integrated interferometer and amplitude-ratio detection enable both high sensitivity and a broad dynamic range.
• PSPWB represents a significant advancement in label-free biosensing capabilities.