Citation: YAN Xingzhonga), WEI Xiong, LUO Tingb), CAI Zhigang, LIANG Zhaoxia), YU Zhenxin. OPTICAL STORAGE MECHANISM AND HIGH-ORDER DIFFRACTION PROPERTIES OF NITROAZOBENZENE-CONTAINING POLYESTER FILMS[J]. Chinese Journal of Polymer Science, ;1998, 16(1): 67-74. shu

OPTICAL STORAGE MECHANISM AND HIGH-ORDER DIFFRACTION PROPERTIES OF NITROAZOBENZENE-CONTAINING POLYESTER FILMS

Received Date: 11 September 1997

Using Nd:YAG second harmonic pulse (100 ps), the optical storage proper-ties of two novel polyesters, poly [4'-bis (N, N-oxyethylene) imino-4-nitroazobenzene suc-cinyl] and poly [2'-chloro-4'-bis (N, N-oxyethylene) iminth-4-nitroazobenzene succiny] havebeen studied by multiwave mixing. The high-order diffractions of the orientation gratingsinduced by anisotropy via the reorientation of nitroazobenzene groups and optical infor-mation storage with long-term stability have been realized by multiwave mixing in their films.Up to 3rd order forward diffraction was detected in two wave mixing,while up to 4th order backward diffraction was observed in degenerated four wave mixing.The recording mechanism was explained by the trans-cis-trans isomerization cycles of azobenzene groups.The isomerization of these azobenzene gruops probably undergoes with inversion mechanism under the experimental conditions.The information recorded in these films has been kept for more than 6 months.
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