Size and shape determination of spheroidal scatterers using two-dimensional angle resolved scattering

Area of Science:

• Optical Physics
• Materials Science
• Nanotechnology

Background:

• Accurate characterization of particle size and shape is crucial for understanding material properties and optical phenomena.
• Existing methods often face limitations in precision, versatility, or applicability to diverse geometries.

Purpose of the Study:

• To develop and demonstrate a novel method for precise determination of the size and shape of spherical and spheroidal scatterers.
• To achieve subwavelength precision in characterizing scatterer geometry using optical measurements.

Main Methods:

• Measurement of backscattered light intensities over a wide range of solid angles using a scanning fiber optic interferometer.
• Application of T-matrix based inverse analysis to two-dimensional angular measurements of light intensity.
• Analysis of both individual and ensembles of scatterers.

Main Results:

• Accurate and unique determination of size and aspect ratio for spherical and spheroidal scatterers.
• Demonstration of subwavelength precision in geometric characterization.
• Successful application across a large range of scatterer geometries.

Conclusions:

• The developed inverse analysis method accurately characterizes scatterer size and shape with high precision.
• This technique offers a versatile tool for optical metrology and material characterization.
• The findings advance the field of light scattering analysis and its applications.