The use of phase masks is necessary for wavefront coding, and these are often based on optical path differences. However, the optical dispersion constrains the resulting device to operate within a restricted spectral bandwidth. Here we propose to remove this constraint due to sub-wavelength structuration of the surface. The use of spatial and spectral co-localization properties of these structures allows the production of various spectrally exclusive phase masks on the same area.

中文翻译：

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用于波前编码的光谱专有相位掩模

对于波前编码，必须使用相位掩模，并且相位掩模通常基于光程差。但是，光学色散会限制所得器件在受限的光谱带宽内运行。在这里，我们建议消除由于表面的亚波长结构而产生的这种约束。这些结构的空间和光谱共定位特性的使用允许在同一区域上产生各种光谱互斥的相位掩模。