Optical bit stability and relaxation processes in a liquid crystal polymer with a photosensitive azo dye molecule as side group

被引：13

作者：

Andreozzi, L

Camorani, P

Faetti, M

Palazzuoli, D

机构：

[1] Univ Pisa, Dipartimento Fis, I-56127 Pisa, Italy

[2] INFM, I-56127 Pisa, Italy

[3] Univ Parma, Dipartimento Fis, I-43100 Parma, Italy

[4] INFM, I-43100 Parma, Italy

来源：

MOLECULAR CRYSTALS AND LIQUID CRYSTALS | 2002年 / 375卷

关键词：

polymeric liquid crystal; birefringence; optical recording; non linear Electron Spin Resonance Spectroscopy; structural relaxation;

D O I：

10.1080/10587250210560

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We present a study of optically-induced molecular relaxation and optical writing processes in a photosensitive liquid crystalline polymer, containing the azobenzene moiety in the side chain. Linear and non linear ESR spectroscopies, thermal analysis and rheology investigations carried on azo polymethacrylate (PMA) samples subjected to different thermal treatments have allowed to single out a suitable procedure to get stable, homogeneous substrates. Optical studies on micrometer length scale, adopting the selected procedure, have confirmed the stability conditions in both unaligned and aligned samples. The temperature dependence of the bit stability has been determined. The writing threshold power and writing rate have been measured. The results are discussed within the perspective of extension to the nanometer length scale.

引用

页码：129 / 142

页数：14

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