2019年新闻


刘颖同学在全息光存储材料研究中取得新进展


  纳米粒子粒径小,表面曲率大,内部会产生很高的吉布斯压力,使纳米粒子有体积效应、表面效应、量子尺寸效应和宏观量子隧道效应等特征。这些特征使得在光致聚合物中掺杂纳米粒子会表现出许多不同特性,纳米颗粒作为掺杂成分能提高全息存储材料的性能。已有的纳米颗粒掺杂方式主要分为直接掺杂和内部生长法,都具有局限性。
  刘颖同学提出了一种新的全息存储材料的纳米颗粒掺杂方式,即用液相激光烧蚀技术直接在聚合物单体中制备纳米颗粒。这种方式能够快速简单地直接在单体中制备出纯净的金属纳米颗粒。制备了新型铝纳米颗粒掺杂的PQ/PMMA纳米复合材料(Al/PQ/PMMA)。


Figure 1. Schematic diagram. (a) Pulsed laser ablation of Al target in MMA solution;
(b) illustration of prime mechanism for the formation process of Al
nanoparticles; (c) the Al dispersed PQ/PMMA material preparation.

  刘颖同学针对制备的Al纳米颗粒以及Al/PQ/PMMA纳米复合材料,对材料性能进行了测试分析,讨论了Al纳米颗粒在体系内的积极作用。所提出Al纳米颗粒掺杂的PQ/PMMA光聚合物在传统全息记录下,衍射效率能够提高到近60%,正交线偏振光记录的偏光全息的衍射效率能够从0.6%提高到4.6%。


Figure 2. Recording dynamics of diffraction efficiency for samples with and without Al NPs
dispersed. (a) Traditional holography, the polarization state of the signal wave and
reference wave were the same vertical polarization (s-polarization); (b) polarization
holography, the polarization state of the signal wave and reference wave were
vertically polarized and horizontally polarized (p-polarization), respectively.

  刘颖同学将Al/PQ/PMMA纳米复合光致聚合物材料,分别应用在同轴式全息存储系统以及离轴式系统中进行了图像复用记录,重建的图像实现了较高保真度和对比度的再现。




Figure 3. Experimental results for volume holographic position multiplexing recording
in Al NPs dispersed PQ/PMMA material. (a) Recorded image, (b) reconstructed
image sets recorded with volume holographic position multiplexing
at the positions (1)-(5) set as 0, 2, 4, 6, 8 um, respectively.

  刘颖同学制备的Al/PQ/PMMA光致聚合物实现了传统PQ/PMMA材料性能的提升,并且为快速、易控制的制备具有多种金属纳米颗粒共同作用掺杂的全息存储材料的提供了一种可行的方法。


  基于以上研究,以“Volume holographic recording in Al nanoparticles dispersed phenanthrenequinone-doped poly(methyl methacrylate) photopolymer”为题目的论文,已被Nanotechnology杂志(影响因子:3.399)接收。并发表在:Vol.30, pp.145202(7p).
  论文的相关链接:https://iopscience.iop.org/article/10.1088/1361-6528/aaf070



(2019.02.05)



This Page was written by Information Photonics Research Center (yhren@fjnu.edu.cn); at Mar. 20, 2019.