SRGs on LC Polymers

Such differences might be at the origin of the distinct phase shifts between the SRG and the interference pattern observed for the gratings 

H Chemical structures of the amorphous ElaP polymer and LC P6al2. From reference62. 

In a series of papers, Yamamoto et have shown the tempera- 

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Furthermore, one should also emphasize that this mean-field-bascd model does not take into account any possible thermal effects. This is an important limitation t ause SRGs on LC polymers are inscribed using hi -laser powers, considerably higher than for the spin-coated, amorphous polymers, and therefore thermal effects might be expected to contribute. For the laser powers used in LC polymers, for example, it has been already shown that thermal effects are not negligible for the amorphous polymers. 

In SRGs inscribed on LC polymer films, time evolution has also been reported in reference 13. TTie depth of the SRG was seen to increase from 70 nm up to 300 nm, 16 h after the writing process was completed. During this period, the samples were left to rest under dark conditions. Ozaki et also showed that the SRG formation processes even after terminating the laser light irradiation on a composite film of an azopolymer and a conducting polymer derived from poly(p-phenylene vinylene). 

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