The shape of transmission spectra of thin films deposited on a substrate.

On the basis of the previous considerations [E. G. Bortchagovsky and U. C. Fischer, J. Chem. Phys. 117, 5384 (2002)] we analyze here the shape of the spectral lines created in transmission spectra by thin films deposited on a substrate. We demonstrate that such lines have as a rule the shape of an asymmetrical Fano line with the minimum shifted from the resonance position. Thus we present the additional argument that the popular visual estimation of the parameters of resonances from the shape of those lines should be made with care.