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High diffraction efficiency in permanent optical memories based on Methyl Red doped liquid crystal

机译:基于甲基红掺杂液晶的永久光学存储器中的高衍射效率

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摘要

This paper proposes a method for enhancing diffraction efficiency in an existing grating by re-illumination of the sample with a secondary pump beam. Though this single-armed pump beam is typically used to erase the grating, in specific conditions, as in our case for Methyl Red doped liquid crystal, it increases the diffraction efficiency. Describing physical background of this enhancement based on the molecules reorientation, high diffraction efficiencies (around 11.5 %) are reported which are not obtainable during the grating formation, even after long exposure times. Concerning the permanency of the obtained efficiency, this system may find various applications in read-only optical data storage devices.
机译:本文提出了一种通过使用次级泵浦光束对样品进行重新照明来增强现有光栅中衍射效率的方法。尽管这种单臂泵浦光束通常用于擦除光栅,但在特定条件下(如我们对甲基红掺杂液晶的情况),它可以提高衍射效率。描述了基于分子重新定向的这种增强的物理背景,据报道,即使在长时间曝光后,仍无法在光栅形成期间获得高衍射效率(约11.5%)。关于所获得的效率的持久性,该系统可以在只读光学数据存储设备中找到各种应用。

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