University of St Andrews, School of Physics and Astronomy, St Andrews, KY16 9SS, UK.
Heriot-Watt University, Institute of Photonics and Quantum Sciences, Edinburgh, EH14 4AS, UK.
Sci Rep. 2017 Jul 3;7(1):4520. doi: 10.1038/s41598-017-04482-2.
Metasurface holograms are typically fabricated on rigid substrates. Here we experimentally demonstrate broadband, flexible, conformable, helicity multiplexed metasurface holograms operating in the visible range, offering increased potential for real life out-of-the-lab applications. Two symmetrically distributed holographic images are obtained when circularly polarized light impinges on the reflective-type metasurface positioned on non-planar targets. The two off-axis images with high fidelity are interchangeable by controlling the helicity of incident light. Our metasurface features the arrangement of spatially varying gold nanorods on a flexible, conformable epoxy resist membrane to realize a Pancharatnam-Berry phase profile. These results pave the way to practical applications including polarization manipulation, beam steering, novel lenses, and holographic displays.
超表面全息图通常在刚性衬底上制作。在这里，我们实验演示了工作在可见光波段的宽带、灵活、顺应、手性复用超表面全息图，为实验室外的实际应用提供了更大的潜力。当圆偏振光照射到位于非平面目标上的反射式超表面时，会获得两个对称分布的全息图像。通过控制入射光的手性，可以实现两个具有高保真度的离轴图像的互换。我们的超表面在柔性、顺应性的环氧树脂基底上排列空间变化的金纳米棒，以实现潘查拉赫姆-贝里相位分布。这些结果为偏振操纵、光束转向、新型透镜和全息显示等实际应用铺平了道路。
