The stable holographic gratings recording is found in cyanine dye/polymer composites under illumination of continuous He-Ne laser (632 nm) at low intensity.
We study cyanine dyes with different molecular structure. As polymer matrix we use various vinyl polymers. The composite samples were prepared by spin-coating method from dichloroethane solution.
The effect of cyanine dyes concentration on the diffraction efficiency of amplitude grating is studied. It is shown that in the researched range the diffraction efficiency rises with the dye concentration decrease.
The recording was performed in the spectral region of dye molecules aggregates displaying. The possible mechanism of the holographic gratings formation in studied composites based on cyanine dyes is discussed.
These composite materials can be used as flexible low-cost media for the holographic recording.

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