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If Deterministic is selected, the ray intensity and power will continuously decrease as rays propagate through the selected domains, but the total number or rays will remain the same. If the number density and size of the scattering particles is spatially uniform, the intensity and power will decay exponentially.
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If Random is selected, rays will have some probability of disappearing as they propagate through the selected domains. If the ray intensity and power are solved for, they will not continuously decrease along the ray trajectories.
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Small spheres (Rayleigh theory) (the default) is an approximate solution for optically small particles. The particle must be much smaller than the wavelength both inside and outside the particle, an important consideration for tiny metallic particles.
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General spheres (Mie theory) is a full solution to the electromagnetic wave equation as a plane wave interacts with a sphere. It is the most accurate solution across a wide range of optical sizes, and the only approach that gives excellent accuracy at intermediate optical sizes, when the wavelength and particle diameter are similar in size. The calculation becomes more time-consuming for extremely large particles.
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Large conducting spheres (isotropic reflection) represents the asymptotic limit of scattering by spheres much larger than the wavelength. The total extinction cross section is double the geometrical cross section of the sphere because the sphere blocks a certain amount of light and also causes diffraction along its perimeter.
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If Specify efficiency factors is selected, enter values or expressions for the dimensionless extinction and scattering efficiency factors.
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If Specify cross section is selected, enter values of expressions for the scattering and absorption cross sections directly.
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