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Vladimir M. Kozenkov¹, Viktor V. Belyaev^1,2, Denis N. Chausov^3,4*

Author affiliations
¹Moscow Region State University «MRSU», Mytishi, Russia
²RUDN University (People’s Friendship University of Russia), Moscow, Russia
³Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia
⁴Moscow University for Industry and Finance "Synergy", Moscow,Russia
*Corresponding author: dn.chausov@mgou.ru

Abstract
A photo-induced anisotropy (PIA) of Methyl Red (MR) azo dye embedded in PMMA polymer solid films was investigated by studying dichroic spectra and photo-induced birefringence. The reversible PIA of MR dye was measured in situ during photoactive irradiation process. Photoinduced order increases with the rise of exposure power. It is shown that PIA dark relaxation slows down at higher exposure energy. The MR rotational diffusion was evaluated at different exposure modes. These data are useful for the characterization of Methyl Red azo dye as a liquid crystal photo-aligning material.

Keywords: Methyl Red, azo dye layers, LC photo-aligning material, photo-induced optical anisotropy, rotational diffusion