We want to get the absorption from multi-reflection interference theory.
We have S11, S21, S12, and S22 parameters with their phases in degree forms.
How can matches the absorption with this theory ( without ground layer).
Please help me,
Thanks and regards
What do you mean by absorption? If you mean absorptance you have to calculate 1-Reflectance-Transmittance. In case you want absorbance, you either take -log10(T/T0) (or -log(R/R0), which would be the transmittance absorbance (reflectance absorbance), sometimes called "apparent absorbance" or you start with the absorption index and multiply it with 4Pi*wavenumber*thickness/ln(10), sometimes called "true absorbance". Apparent absorbance and true absorbance do not agree, not even when you use an index-matched substrate. See. e.g.,
Article Removing interference-based effects from the infrared transf...
Article Removing interference-based effects from infrared spectra - ...
Article CaF2: An Ideal Substrate Material for Infrared Spectroscopy?
or my lecture notes, which present everything in context:Preprint Wave optics in Infrared Spectroscopy
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