Nanocomposites and nanomaterials

Chromium nanofilms on a glass substrate: the first element of the Mueller matrix

Yevgen Oberemok1, Sergey Savenkov1, Chen Xiaohong2, Zhao Zhenjie2, Sun Zhuo2, Andrii Sizhuk1, Oleksandr Prokopenko1
1Taras Shevchenko Kyiv National University, Glushkova ave. 4g, Kyiv, Ukraine
E-mail: oberemok.ye@gmail.com
2 Shanghai East China Normal University, Shanghai, China
The set of chromium nanofilms, with the layer thickness from 90 nm to 250 nm, was deposited by the method of a thermal sputtering on glass plates. The Mueller matrix elements for the set of chromium nanofilms are calculated based on the observed intensities of the incident and reflected from the surfaces light beams in the four initial polarization states. The demonstrated in the graph Fig. 1 below nonnormalized element M11 of the Mueller matrix corresponds to the ratio between the intensity of an incident nonpolarized beam and the intensity of the reflected beam at the different exposition times. The light beam was generated by a He-Ne laser (at about 633 nm wavelength). The nanofilms are opaque for the laser beam with the power of 15 mW. The dependence on the thickness of the nanofilms was not observed. The age of the samples is about 1 year. 

Fig. 1. Nonnormalized element M11 of the Mueller matrix as the function of the angle of incidence at the different exposition times, namely 5, 6, and 7 minutes. Note the appearance of the local minimums.