I suggest to you softwares based on rigorous coupled-wave analysis.

- http://mrcwa.sourceforge.net/ (Multilayer Rigorous Coupled Wave Analysis)

- http://web.stanford.edu/group/fan/S4/

These are two examples of free softwares that can help you.

" Actually, I use COMSOL Multiphysics to simulate transmittance and reflectance, but the software is not free "

Regards

I use IMD http://www.rxollc.com/idl/ 

it is simple to use and works very well for me.

I suggest RefFIT: http://optics.unige.ch/alexey/reffit.html. The author is also on ResearchGate:

https://www.researchgate.net/profile/Alexey_Kuzmenko

Be patient I will send you.

I am good at programming in Qbasic/VisualBasic.Therfore I have huge programm collection. It will take time to find out the convinent software for you.

I agree with Abdulkadir Sertap Kavasoglu; in a nutshell, all simulation software are based on mathematical models that can be written into algorithms. It is far better for one to learn to code such algorithms than to apply ready made, often heuristic programs. Even simple spreadsheets, such as Microsoft Excel, can be used to great effect - usually without even resorting to the developer layer elements such as macros. Ultimately, one then can modify program parameters to make useful additional predictions.

Softwarre and example input parameters attched. You may plot data using suitable graphic editör programs.

I can not attach the software, I think  system did not let me to attach due to security precautions.

Please send your email.

Dear  Mahesha M G 

I have sent an email ([email protected])  for you

Dear

Abdulkadir Sertap Kavasoglu and Mahesha M G

Can you share me the same software

email - [email protected]

Dear

Abdulkadir Sertap Kavasoglu and Mahesha M G Please would you share the same software with me? I am looking into the optical properties of Dielectric Metal Dielectric (Tri layer) thin films. Kind regards

email. [email protected]

ABdelkader there is anew method for calculation optical properties of thin films evaborated on glass substrate the sdress of the article is "A new method of finding the optical constants of a solid from the reflectance and transmittance spectrograms of its slab"

Optics Communications 174 2000. 445–453

could you please make program for this new method