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Published on: July 1, 2019
Light scattering by optically soft large particles of arbitrary shape
1B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, Minsk, Belarus. mal@light.basnet.by
Summary
Light scattering from large, soft particles is independent of shape outside forward direction. A new formula accurately describes scattering patterns and optical properties, determined by particle surface area and size.
Area of Science:
- Optics and Photonics
- Materials Science
- Physical Chemistry
Background:
- Understanding light scattering from particles is crucial in various scientific fields.
- Previous models often simplify particle shapes or orientations, limiting applicability.
- The Rayleigh-Gans approximation is suitable for optically soft, large particles.
Purpose of the Study:
- To analyze light scattering patterns from chaotically oriented, optically soft particles of arbitrary shape.
- To develop a universal formula for describing scattering patterns across all angles.
- To investigate the relationship between scattering properties and particle characteristics.
Main Methods:
- Application of the Rayleigh-Gans approximation for light scattering analysis.
- Derivation of scattering pattern dependencies based on wave vector differences and scattering angles.
- Development and validation of a simple approximating formula for scattering patterns.
- Comparison with scattering from size-distributed spherical particles.
Main Results:
- The scattering pattern, outside the forward direction, follows
Δk⁻⁴(1+cos²θ), independent of particle shape. - A novel approximating formula accurately describes the scattering pattern across all angles.
- Inherent optical properties (total, transport, backward scattering coefficients) are determined by specific surface area and effective particle size.
Conclusions:
- Particle shape does not influence the angular dependence of light scattering for large, soft particles beyond the forward direction.
- The proposed approximating formula offers high accuracy for diverse particle ensembles.
- Specific particle surface area and effective particle size are key determinants of bulk optical properties.
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