Decoupling optical function and geometrical form using conformal flexible dielectric metasurfaces.
Decoupling optical function and geometrical form using conformal flexible dielectric metasurfaces.
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DOI：
10.1038/ncomms11618
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发表时间：
2016-05-19
影响因子：
16.6
通讯作者：
Faraon A
中科院分区：
文献类型：
--
作者：
Kamali SM;Arbabi A;Arbabi E;Horie Y;Faraon A
物体的物理几何和光学性质是相关的：圆柱体将光聚焦到一条线上，球体将光聚焦到一个点上，任意形状的物体会引入光学像差。当必须提供特定的光学功能，而形状由人体工程学、空气动力学或美学等其他考虑因素决定时，需要具有解耦几何形状和光学功能的多功能组件。在这里，我们展示了一种利用符合物体表面并改变其光学性质的薄而柔性的介电超表面将物体的光学性质与其物理形状解耦的方法。共形超表面由嵌入在聚合物衬底中的硅纳米柱组成，该聚合物衬底局部修饰近红外（λ=915 nm）光波前。作为概念证明，我们展示了覆盖超表面的圆柱形透镜可以转换为将光聚焦到一个点的非球面透镜。共形超表面的概念对于开发任意形状的多功能光学器件具有很强的通用性。实现具有解耦几何形状和光学函数的组件是各种应用的兴趣。在这里，Kamali等人引入了基于发射阵列平台的柔性超表面，可以将其与非平面任意形状的物体结合，随意修改其光学特性。
Physical geometry and optical properties of objects are correlated: cylinders focus light to a line, spheres to a point and arbitrarily shaped objects introduce optical aberrations. Multi-functional components with decoupled geometrical form and optical function are needed when specific optical functionalities must be provided while the shapes are dictated by other considerations like ergonomics, aerodynamics or aesthetics. Here we demonstrate an approach for decoupling optical properties of objects from their physical shape using thin and flexible dielectric metasurfaces which conform to objects' surface and change their optical properties. The conformal metasurfaces are composed of silicon nano-posts embedded in a polymer substrate that locally modify near-infrared (λ=915 nm) optical wavefronts. As proof of concept, we show that cylindrical lenses covered with metasurfaces can be transformed to function as aspherical lenses focusing light to a point. The conformal metasurface concept is highly versatile for developing arbitrarily shaped multi-functional optical devices. Realizing components with decoupled geometrical form and optical function are of interest for various applications. Here, Kamali et al. introduce flexible metasurfaces based on a transmitarray platform that can be conformed to a non-planar arbitrarily shaped object to modify its optical properties at will.