We propose a novel design of a 3D chiral metasurface behaving as a spatial polarization converter with asymmetric transmission. The metasurface is made of a lattice of metallic one-and-a-half-pitch helical particles. The proposed metasurface exhibits a dual-band asymmetric transmission accompanied by the effect of complete polarization conversion. Regarding circularly polarized waves, the metasurface demonstrates a strong circular dichroism. A prototype of the metasurface is manufactured for the quasi-optic experiment by using a 3D printing technique utilizing a cobalt–chromium alloy, which exhibits good performances against thermal fatigue and corrosion at high temperatures.

中文翻译：

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3D打印手性超颖表面作为二向色双频偏振转换器

我们提出了一种3D手性超颖表面的新颖设计，该设计表现为具有不对称透射的空间极化转换器。超表面由金属的半个螺距的螺旋状颗粒的晶格制成。提出的超颖表面表现出双频非对称传输，并伴有完全极化转换的影响。关于圆极化波，超颖表面表现出很强的圆二色性。通过使用钴铬合金的3D打印技术，为准光学实验制造了超颖表面的原型，该技术在高温下表现出良好的抗热疲劳和腐蚀性能。