设计了可聚焦红绿蓝三色光的偏振复用超表面器件。该器件通过几何相位原理调整二氧化钛纳米柱的旋转角以实现对入射光场的调控,仅使用三种不同尺寸的纳米柱便可获得较高的偏振转换效率。通过将三色光分别聚焦至同一焦平面的不同位置处,基于偏振响应特性实现了焦点位置可控。所设计的超表面器件可作为紧凑型光学器件应用在便携式成像系统、偏振器件和加密信息传输等领域。

A polarization multiplexed metasurface is designed to focus red, green and blue light. This metasurface adjusts the rotation angle of titanium dioxide nano-pillars to achieve the modulation of incident light based on the geometric phase principle. The high polarization conversion efficiency can be achieved by only three different nano-pillar sizes. This metasurface can focus three-color light on the different positions of the same focal plane and thus to realize the control of focus position based on the polarization response characteristics. The metasurface device designed here can be used as a compact optical device in the fields of portable imaging systems, polarized devices, encrypted information transmission, and so on.