The simplest way is to use the already determined values for refractive index and thickness for calculation of transmittance spectra and compared it to the measured one. However it is obvious from the spectra that the film is not homogeneous. I have some doubts about the correctness of your calculations. What type are your substrate and film? How thick is the film?

Thank you Dr. Babeva for your answer. The substrate is glass. The film is novel organic complex DPPB-Cr (diphenylphosphino vinyl chromium). Film thickness is 10 nm.

Dear Mostafa El-Aasser, check your measurements again. It is not possible film with thickness of 10 nm to have a spectra as yours. The thickness value of 10 nm is too low in order interference peaks to be observed in VIS-NIR spectral range.

Thank you Dr. Babeva. I will check it.

Can not I have interference peaks from nantostructured few-nanometer thin film?

Please, check out the attached article, it has interference peaks in Ge-thin film with few nanometer thickness. 

The transmittance spectra in Fig.4 are for MULTILAYERED system where thin films from TiO2 and Ge are deposited alternatively and form system with substantial overall thickness. As I say above, the transmittance and reflectance spectra of  few nanometers films do not exhibit interference phenomena  in the visible and NIR spectral ranges. It is possible to observe interference peaks  only for X-rays. My advice is to take some time to read about thin films interference. Regards

Thank you very much for your time.

You are 100% right if this is a regular thin film.

Our work also has one layer, two layers, three layers thin film. The absorption spectrum is attached. We have 50 nm blue shift in the absorption peak as we add more layer from 1 to 2 to 3 layers. Each layer is 10 nm. While the 1st layer is DPPB-Cr, the 2nd is DPPB-Cr-enamine, the third is DPPB-Cr-enamine-Cu.

As they are crystalinene Cr and Cu look like nano plasmonic paticles arranged in a periodic nanostructured network. So the three layers look like volumetric plasmonic resonator. Please, see the attached absorption spectrum for them.

Thanks a lot

If you are bale to etch a step in your film, try to measure the thickness of the film with a thickness profilometer, and see how close the thickness value matching with the measured thickness from Optical transmission spectrum.

K. Sreenivas

Thank you Dr. Sreenivas for your reply.

Unfortunately, we do not have profilometer to measure the thickness of the film.

Is there a free software that can estimate the thickness from T, R, A measurements?