论文标题
在角度的白光照明下，在衍射光栅中对隐藏颜色信息的完全几何控制
Full Geometric Control of Hidden Color Information in Diffraction Gratings under Angled White Light Illumination
论文作者
论文摘要
在白光照明下，光栅产生了取决于衍射顺序和几何参数的波长的角度分布。但是，先前对光栅的研究仅限于至少一个几何参数（高度，周期性，方向，入射角）保持恒定。在这里，我们使用多功能纳米制作技术（两光片聚合光刻）在光栅中改变了所有几何参数，以通过2种设计方法来编码隐藏的颜色信息。第一种方法通过将光栅高度和周期性在正常和倾斜的发生率下的效果解耦，从而掩盖了颜色信息。第二种方法通过在半圆形像素周围安排光栅来掩盖多组颜色信息。在倾斜的发生率和不同样品旋转角度下，用微不足道的串扰揭示了不同的图像。我们的分析表明，需要在相邻部门之间进行角度分离> = 10°以抑制串扰。这项工作在信息存储和安全水印中具有潜在的应用。
Under white light illumination, gratings produce an angular distribution of wavelengths dependent on the diffraction order and geometric parameters. However, previous studies of gratings are limited to at least one geometric parameter (height, periodicity, orientation, angle of incidence) kept constant. Here, we vary all geometric parameters in the gratings using a versatile nanofabrication technique, two-photon polymerization lithography, to encode hidden color information through 2 design approaches. The first approach hides color information by decoupling the effects of grating height and periodicity under normal and oblique incidence. The second approach hides multiple sets of color information by arranging gratings in sectors around semi-circular pixels. Different images are revealed with negligible crosstalk under oblique incidence and varying sample rotation angles. Our analysis shows that an angular separation >= 10° between adjacent sectors is required to suppress crosstalk. This work has potential applications in information storage and security watermarks.
