Barton I, Blair P, Taghizadeh M R
Opt Express. 1997 Jul 21;1(2):54-9. doi: 10.1364/oe.1.000054.
We report on the design and fabrication of novel diffractive phase elements that reconstruct distinct intensity patterns in the far-field on illumination with two specific wavelengths. The elements contain deep surface-relief structures that represent phase-delays of greater than 2p radians. The design process incorporates a modified version of the iterative Fourier transform algorithm. A 16 phase-level element for dual wavelength (blue and red) operation, with high diffraction efficiency, is demonstrated experimentally.
我们报告了新型衍射相位元件的设计与制造，这些元件在使用两种特定波长照明时能在远场重建不同的强度图案。这些元件包含深度表面浮雕结构，其代表的相位延迟大于2π弧度。设计过程采用了迭代傅里叶变换算法的改进版本。实验展示了一种用于双波长（蓝色和红色）操作、具有高衍射效率的16相位级元件。
