Quantum noise limited nanoparticle detection with exposed-core fiber

Area of Science:

• Biomedical Engineering
• Optics and Photonics
• Nanotechnology

Background:

• Label-free biosensors are crucial for diagnostics and single-molecule biology.
• Existing optical sensors offer sensitivity but risk sample photodamage and complexity.
• Fragile sensor designs limit practical applications in biological research.

Purpose of the Study:

• To develop a robust, highly sensitive label-free biosensor.
• To overcome limitations of existing optical biosensing technologies.
• To create a platform suitable for microfluidic integration and minimizing photodamage.

Main Methods:

• Utilized a quantum noise limited exposed-core fiber sensor design.
• Implemented label-free detection principles.
• Tested sensor performance with nanoparticles as small as 25 nm in radius.

Main Results:

• Demonstrated detection of single nanoparticles down to 25 nm.
• Achieved high sensitivity using low optical intensities.
• The sensor platform proved robust and stable for biosensing.

Conclusions:

• The developed fiber sensor offers a sensitive and robust platform for label-free biosensing.
• This technology minimizes photodamage, enabling new biological studies.
• The sensor design facilitates integration with microfluidic systems for advanced diagnostics.