全息光栅的可擦除存储性能研究

Research on Image Erasable Storage based on Holographic Gratings

本文制备了高衍射效率的全息光栅,并对其进行了图像的可擦除存储性能研究。选用五官能度的二季戊四醇羟基五丙烯酸酯、二官能度的邻苯二甲酸二甘醇二丙烯酸酯以及向列相液晶TEB30A作为存储材料,将其置于全息干涉场中记录图像;采用He-Ne激光器实现图像的再现,并通过对全息光栅施加电场来改变光栅内液晶分子的取向,降低光栅的折射率调制度,从而使图像消失;最终得到了衍射效率为85.6%的全息光栅,通过He-Ne激光器实现了图像的再现,并在外加电场为50V时使图像基本消失,实现了图像的可擦除存储功能。

Holographic grating with high diffraction efficiency was fabricated in this paper, and its erasable storage poperties were investigated. Penta-functional dipentaerythritol hydroxyl pentaacrylate, di-functional phthalic diglycol diacrylate and nematic liquid crystal TEB30A were chosen as storage materials, which could store image when put into the interference field. Image reconstruction was realized when He-Ne laser incident on the grating with Bragg angle. The image could disappear when a certain electric field was applied on the holographic grating because the refractive index of the liquid crystal field was changed. The experimental results indicated that the image could be stored using holographic grating of which diffraction efficiency could reach 85.6%. And the image could be reconstructed through He-Ne laser and also basically disappeared when 50 V electric field was applied on the holographic grating.