In all of the examples, complex material indices of refraction are specified by constant values. The SCATMECH library, however, allows the use of external files which contain the optical constants as functions of wavelength. Such a file should be a text file containing three tab-delimited columns, in which the first column represents the wavelength, the second column the index of refraction, and the third column the absorption coefficient. The optical properties of the substrate, for example, can then be specified by the following model parameter declaration
The “Transfer directly as a string to model” box must be checked, or MIST will try to interpret “silicon.txt” as a numeric expression. The dollar sign ($) in front of the parameter name indicates that the string will be sent directly to the model. In this manner, the VARIED PARAMETERS section statement
will allow the reflectance to be calculated over a variety of wavelengths even though the optical properties of the substrate are wavelength dependent.
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Latest MIST Version: 4.10 (October 2017)