Light Scattering from Fluctuations and the Structure Factor

3 Light Scattering from Fluctuations and the Structure Factor 

Fluctuations in the optical properties of a material can induce spatial and temporal inhomogeneities that scatter light. In general, the dielectric tensor is taken as the following function of space and time, 

The light scattered from such a disturbance is found by simply replacing the term 

Using the result for the Green s function in equations (1.47) and (1.49), the scattered field is 

The fluctuations in e arise from spatial and temporal variations in the temperature, density, and concentration fields throughout the sample. In other words, 

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