Measuring the complex forward-scattering amplitude of single particles by self-reference interferometry: CAS-v1...

Area of Science:

• Optical physics
• Particle characterization
• Metrology

Background:

• Accurate measurement of single particle complex forward-scattering amplitude is crucial for diverse scientific applications.
• Existing methods often lack the precision or universality required for real-time analysis of particles in flow.

Purpose of the Study:

• To establish the theoretical and experimental foundations for measuring single particle complex forward-scattering amplitude using self-reference interferometry.
• To identify key parameters influencing measurement accuracy and resolution.
• To propose a practical protocol for universal application.

Main Methods:

• Development of theoretical models for self-reference interferometry in particle scattering.
• Experimental validation of the theoretical framework.
• Analysis of nondimensional parameters governing measurement performance.

Main Results:

• Identification of critical nondimensional parameters that dictate the accuracy and resolution of complex amplitude measurements.
• Demonstration of self-reference interferometry's capability for precise single particle analysis.
• Validation of the proposed Complex Amplitude Sensing version 1 (CAS-v1) protocol.

Conclusions:

• Self-reference interferometry provides a robust platform for measuring single particle complex forward-scattering amplitudes.
• The CAS-v1 protocol offers a universal and effective tool for inline, real-time particle measurements.
• This advancement is poised to benefit industrial, biomedical, and environmental science applications.