For metal or doped semiconductor like ITO, FTO, AZO the transmission spectra falls down at visible or NIR region. With increasing electron concentration, one can see the %T graph fall more rapidly and at lower wavelength... I would like to know why??
Plasmon frequency Wp is proportional to N^0.5, that I know.
But I want to know the physical reason behind the phenomenon.
i.e why the natural frequency of vibration increases with increasing electron density?
Please have a look on the attachment for example.
Thickness of both the films is same 350 nm.
Only difference is different conductivity and hence electron concentration.
Have you studied the theory developed by Paul Drude in 1900 (see e.g. https://en.wikipedia.org/wiki/Drude_model )? It should give you all the answers you are looking for...
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