Reality Display Device Research Group, Electronics and Telecommunications Research Institute, Daejeon 34129, Republic of Korea.
Nanoscale. 2018 Nov 29;10(46):21648-21655. doi: 10.1039/c8nr04471f.
We propose rewritable full-color computer-generated holograms (CGHs) based on color-selective diffraction using the diffractive optical component with the resonant characteristic. The structure includes an ultrathin layer of phase-change material Ge2Sb2Te5 (GST) on which a spatial binary pattern of amorphous and crystalline states can be recorded. The CGH patterns can be easily erased and rewritten by the pulsed ultraviolet laser writing technique owing to the thermally reconfigurable characteristic of GST. We experimentally demonstrate that the fabricated CGH, having a fine pixel pitch of 2 μm and a size of 32.8 × 32.8 mm2, reconstructs the three-dimensional holographic images. In addition, the feasibility of the rewritable property is verified by erasing and rewriting part of the CGH.
我们提出了一种基于使用具有共振特性的衍射光学元件进行颜色选择衍射的可重写全彩色计算机生成全息图（CGH）。该结构包括一层极薄的相变材料 Ge2Sb2Te5（GST），其上可以记录非晶态和晶态的空间二进制图案。由于 GST 的热可重构特性，CGH 图案可以通过脉冲紫外激光写入技术轻松擦除和重写。我们通过实验证明，所制造的 CGH 具有 2μm 的精细像素间距和 32.8×32.8mm2 的尺寸，可以重建三维全息图像。此外，通过擦除和重写 CGH 的一部分来验证可重写特性的可行性。
