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Scattering of light by bispheres with touching and separated components.
Applied Optics
|November 6, 2010
Summary
Light scattering by bispheres primarily resembles scattering from single spheres when randomly oriented. Cooperative scattering effects are minimal, with distinct nonsphericity observed only in specific scattering matrix elements and depolarization ratios.
Area of Science:
- Atmospheric Optics
- Computational Electromagnetics
- Light Scattering
Background:
- Mineral aerosols significantly influence Earth's radiative budget.
- Accurate modeling of light scattering by nonspherical particles is crucial for climate studies.
- Previous research extensively studied light scattering by spheroids and Chebyshev particles.
Purpose of the Study:
- To compute and analyze light scattering by bispheres using the T-matrix method.
- To investigate the impact of orientation (fixed vs. random) on scattering patterns.
- To compare bisphere scattering with that of single spheres and other nonspherical particles.
Main Methods:
- Utilized the T-matrix method for light scattering computations.
- Employed a fixed refractive index (1.5 + 0.005i) representative of mineral aerosols.
- Performed extensive calculations for bispheres in both fixed and random orientations.
Main Results:
- Randomly oriented bisphere scattering patterns closely resemble those of single spheres of equivalent component size.
- Unlike spheroids, bispheres show no significant enhancement of side scattering or reduction of backscattering.
- Distinct nonsphericity effects appear in scattering matrix elements (F(22)/F(11), F(33)/F(11), F(44)/F(11)) and depolarization ratios.
Conclusions:
- The dominant light scattering feature of randomly oriented bispheres is single scattering from their components.
- Cooperative scattering and concavity effects play a minor role in overall scattering patterns.
- Component spheres in bispheres act independently when separated by approximately 4 times their radii.
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