My question is that either we can draw the absorption spectrum directly by FDTD or we use any other software to represent it because reflection and transmission can be draw directly by FDTD but how absorption spectrum. Please guide me in this regard if it is directly from FDTD then guide me how we draw spectrum of absorption from FDTD or share any tutorial for this.
FDTD cannot directly calculate absorptance (or absorbance), but if you have the reflectance and the transmittance spectrum, then you can calculate absorptance A by A=1-R-T for every wavelength point. Similarly you get absorbance A by A=-log10(T+R).
Thomas Mayerhöfer But sir, How people show the spectrum of absorption in their articles.?
Depends on the community. Molecular spectroscopists nowadays prefer absorbance, since for weak absorptions and homogeneous samples it is approximately proportional to molar concentration. In more physics-oriented communities I would use absorptance.
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