Nanooptics and photonics

Polarization sensitive holographic media
Davidenko I.I., Davidenko N.A., Pavlov V.A., Chuprina N.G., Kuranda N.N., Tarasenko V.V., Mokrinskaya E.C.
Kiev Taras Shevchenko National University.
Volodymyrs’ka Str., 64/13, Kyiv-01601, Ukraine. 
E-mail: IrynaDavydenko@gmail.com

The films of polymeric composites with monomers of azobenzene dyes or containing azobenzene lateral groups chemically bonded to the main polymeric chain possess photoactive properties. These films can be used for electrooptic light modulators and recording media (RM) for polarization holography. Usually RM with high diffraction efficiency of the recorded holograms are necessary. New method of adjustment of the diffraction efficiency of the polarization holograms by external electric field is proposed in this work. This method is firstly used in the films of series of new copolymers of azobenzene derivatives with octylmethacrylate (Fig. a).

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After recording with small exposure energies the diffraction efficiency in electric field decreases, and for high exposure energies it increases. The field was formed by corona discharge. The diffraction efficiency and recording velocity are higher in copolymers with lower softening temperature. The effect is attributed to reorientation of dipole moments of isomers of azobenzene fragments in the electric field.