Li Xiangping, Chon James W M, Wu Shuhui, Evans Richard A, Gu Min
Center for Micro-Photonics, Faculty of Engineering and Industrial Sciences, Swinburne University of Technology, P.O. Box 218, Hawthorn, Victoria 3122, Austrailia.
Opt Lett. 2007 Feb 1;32(3):277-9. doi: 10.1364/ol.32.000277.
We report a rewritable polarization-encoded multilayer data storage method with a polymer film doped with the azo dye DMNPAA (2,5-dimethyl-4-(p-nitrophenylazo)anisole). It is found that under two-photon excitation by a linearly polarized femtosecond laser beam at wavelength 780 nm the optical axis of DMNPAA molecules can be oriented to the perpendicular direction of the beam via a trans-cis-trans isomerization process. As a result, multilayer polarization-encoded optical data storage is demonstrated by recording two letters of a bit spacing of 4 microm in the same region of a given layer. It is shown that erasing and rewriting a particular layer is possible.
我们报道了一种可重写的偏振编码多层数据存储方法，该方法使用掺杂了偶氮染料DMNPAA（2,5-二甲基-4-（对硝基苯基偶氮）苯甲醚）的聚合物薄膜。研究发现，在波长为780nm的线偏振飞秒激光束的双光子激发下，DMNPAA分子的光轴可通过反式-顺式-反式异构化过程定向到光束的垂直方向。结果，通过在给定层的同一区域记录位间距为4微米的两个字母，展示了多层偏振编码光学数据存储。结果表明，可以擦除和重写特定层。
