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| The Fraunhofer
theory is applicable for large particles compared to the wavelength l
(diffusion and absorption are not considered).
For smaller particles, it is appropriate to use Mie Theory. |
• | The
Mie model takes into account both diffraction and diffusion of the light
around the particle in its medium.
To use the Mie model, it is necessary to know the complex refractive index of both the sample and the medium. This complex index has a real part, which is the standard refractive index, and an imaginary part, which represents absorption. Complex index = m
Because of the importance of this model, CILAS has crated a fast algorithm, which enables the user to get, within seconds, diffusion results using Mie theory and taking into account the complex index of the sample. |
 |