Dear Mostafa Shabani,

You may want to review the following articles:

https://www.osapublishing.org/oe/fulltext.cfm?uri=oe-17-10-8621&id=179489

https://www.tandfonline.com/doi/abs/10.1080/108939500199619

https://aip.scitation.org/doi/full/10.1063/1.5013662

https://eeexplore.ieee.org/abstract/document/6547155

Dear Mostafa Shabani,

There is relevant info in the articles presented below as well:

https://www.nature.com/articles/s41598-017-14093-6

https://www.cambridge.org/core/journals/mrs-online-proceedings-library-archive/article/abs/optical-characterization-of-hydrogenated-silicon-films-in-the-extended-energy-range/ED218746FD6455CC9EB1888261778466

Len Leonid Mizrah

Thank you Mr. Mizrah, your comments are always helpful. But I'm actually looking for THz optical refractive index or the dielectric number of these semiconductors. really I want to know is it possible to use 11.9 as the dielectric number for this frequency region for a-silicon or not.

Dear Mostafa Shabani,

See the article below - it's focused on providing experimental and theoretical considerations to the question you're concerned:

https://www.osapublishing.org/ome/fulltext.cfm?uri=ome-11-3-858&id=447903

Dear Dr Mostafa Shabani . See the following useful RG link: Article Optical Properties of Semiconductors. III. InfraRed Transmis...

Kindly check also the following useful RG link: Article Optical properties of silicon thin films related to LPCVD gr...

Also check please the following very good RG link: Article Optical transmission losses in polycrystalline silicon strip...

The following RG link is very useful: Article Optical absorption coefficient of polycrystalline silicon wi...

Dear Mostafa Shabani

kindly check this paper also:

Article Structural and Optical Properties of Polycrystalline Silicon...

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