Multi wavelength measuring of the gold nanoparticles by the optical fiber interferometer

Key Points

• The aim is to measure the size and concentration of gold nanoparticles using a fiber-optic interferometer.
• Utilized a fiber-optic Mach-Zehnder sensor for measurement.
• Implemented a dual-wavelength approach for simultaneous detection.
• Achieved a detection limit of 8×10⁶ particles/mL for 100 nm gold nanoparticles.
• Demonstrated effective size discrimination of gold nanoparticles via absorption ratio.
• Achieved successful real-time monitoring with a robust all-fiber design.