Why do ultrathin films of polymer have very high refractive indexes when measured by ellipsometry?

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Virginie Marie Boucher

Thin films have higher refractive index because they are physically aged. The thinner the films the faster the physical aging process. Details can be found in the following article:

https://www.researchgate.net/publication/232957023_Enthalpy_Recovery_in_Nanometer_to_Micrometer_Thick_Polystyrene_Films?ev=prf_pub

Article Enthalpy Recovery in Nanometer to Micrometer Thick Polystyrene Films

Hamdy F. M. Mohamed

Thanks for good answser. What do you think about the anisotropy in ultrathin film. Details can be found in the attached

Sorry thsi is the attached paper. I got very high refractive index for ultrathin film of polymer less than 12 nm (within 2.6). I do not have an interpertation for thiis high value