Holographic Image Storage and Display Based on Photoinduced Change in Refractive Index of Polymer Liquid Crystals with photochromic Moieties

基于光致变色聚合物液晶折射率变化的全息图像存储与显示

• 批准号: 10450362
• 负责人: IKEDA Tomiki
• 金额: $ 7.49万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10450362/
• 关键词: Photochromism; Polymer Liquid Crystals; Polymer Azobenzene Liquid Crystals; Photoinduced Change in Refractive Index; 3-Dimensional Image Storage; 3-Dimensional Display; Hologram; Grating; フォトクロミック分子; 三次元光表示

Photochemical phase transition of liquid crystals (LCs) can be induced by a photochemical reaction of photochromic molecules. For example, when an azobenzene structure is introduced to LC molecules as the photosensitive moiety, the photochemical LC-to-isotropic phase transition takes place isothermally by the transcis photoisomerization of the azobenzene. We have developed holographic materials by means of polymer azobenzene LCs. On irradiation of a couple of coherent light beams, the real-time hologram was created by periodic induction of photochemical phase transition in polymer azobenzene LCs. Observation of the grating structure with a polarizing microscope confirmed that the isotropic phase was arranged with a spatial resolution of < 1μm which corresponds to a storage capability of > 400 Mbits/cmィイD22ィエD2. Under the optimal experimental condition, 28% of diffraction efficiency and 60 ms of writing time were achieved. When 2-dimensional or 3-dimensional images were stored in the polymer azobenzene LC films, clear reconstructed images were observed with high contrast and high resolution. We thus can expect that a high-density 3-dimensional image storage is possible with the polymer azobenzene LCs.

液晶的光化学相变是由光致变色分子的光化学反应引起的。例如，当偶氮苯结构作为光敏部分引入LC分子时，通过偶氮苯的交叉光异构化，光化学LC到各向同性的相变将等温发生。我们利用聚合物偶氮苯液相色谱技术开发了全息材料。在几束相干光束的照射下，通过周期性诱导聚合物偶氮苯LCs的光化学相变形成实时全息图。用偏光显微镜对光栅结构的观察证实，各向同性相排列的空间分辨率< 1μm，对应的存储容量为> 400 Mbits/cm。在最佳实验条件下，衍射效率提高28%，写入时间为60 ms。将二维或三维图像存储在聚合物偶氮苯LC薄膜中，可以观察到清晰的高对比度和高分辨率重建图像。因此，我们可以期望聚合物偶氮苯lc可以实现高密度的三维图像存储。

项目成果

M. Hasegawa, T. Yamamoto, A. Kanazawa, T. Shiono, T. Ikeda, Y. Nagase, E. Akiyama and Y. Takamura: "Real-Time Holographic Grating by Means of Photoresponsive Polymer Liquid Crystals with Flexible Siloxane Spacer in the Side Chain"J. Mater. Chem.. 9. 2765-

M. Hasekawa、T. Yamamoto、A. Kanazawa、T. Shiono、T. Ikeda、Y. Nagase、E. Akiyama 和 Y. Takamura：“利用具有柔性硅氧烷间隔物的光响应聚合物液晶实现实时全息光栅

T.Yamamoto: "Phase-Type Gratings Formed by Photochemical Phase Transition of Polymer Azobenzene Liquid Crystals: Enhancement of Deffraction Efficiency by Spatial Modulation of Molecular Alignment"J.Phys.Chem.B. 103. 9873-9878 (1999)

T.Yamamoto：“聚合物偶氮苯液晶光化学相变形成的相型光栅：通过分子排列的空间调制增强衍射效率”J.Phys.Chem.B。

T.Yamamoto: "Holographic Gratings and Holographic Image Storage by Photochemical Phase Transition of Polymer Azobenzene Liquid-Crystal Films"J.Mater.Chem.. 16. 337-342 (2000)

T.Yamamoto：“通过聚合物偶氮苯液晶薄膜的光化学相变实现全息光栅和全息图像存储”J.Mater.Chem.. 16. 337-342 (2000)

T. Yamamoto: "Holographic Gratings and Holographic Image Storge by Photochemical Phase Transition of Polymer Azobenzene Liquid-Crystal Films"J. Mater. Chem.. 10. 337-342 (2000)

T. Yamamoto：“聚合物偶氮苯液晶薄膜光化学相变的全息光栅和全息图像存储”J。

M. Hasegawa: "Real-Time Holographic Grating by Means of Photoresponsive Polymer Liquid Crystals with Flexible Siloxane Spacer in the Side Chain"J. Mater. Chem.. 9. 2765-2772 (1999)

M. Hasekawa：“利用侧链带有柔性硅氧烷间隔基的光响应聚合物液晶实现实时全息光栅”J。