When we do DFT study of optical properties of a material ,what kind of behaviour of final graphs of n, ìdielectric is considered good and what is not a good behaviour.is thete any criteria for that???
Dear Asma,
I'm not sure I understand the question of yours. Several types of dispersion are possible in materials depending on composition. Most common one is the normal dispersion (described by Cauchy or Sellmeier formula), present in most of the materials. Normal dispersion means that the refractive index decreases with the wavelength. Another type of dispersion is so called anomalous dispersion. It is however important to know your material. At least the information about the fundamental absorption edge and the phonon absorption (consequently the free carrier absorption-depending on your material). From my point of view, there is no what you call good behavior, just the behavior depending on the material. I hope you got my point. Thank you very much.
Best regards,
TH
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