Dielectric metasurfaces for complete and independent control of the optical amplitude and phase
Dielectric metasurfaces for complete and independent control of the optical amplitude and phase
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DOI：
10.1038/s41377-019-0201-7
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发表时间：
2019-10-09
影响因子：
19.4
通讯作者：
Yu, Nanfang
中科院分区：
文献类型：
--
作者：
Overvig, Adam C.;Shrestha, Sajan;Yu, Nanfang
超表面是光学薄的超材料，承诺完全控制光的波前，但主要用于控制光的相位。在这里，我们提出了一种概念和实践上都很简单的方法，即使用具有不同程度形式双折射和旋转角度的元原子来创建高效率的介电超表面，该超表面可以在一个或两个频率上控制光学振幅和相位。这打开了计算机生成全息术的应用，允许忠实地再现目标全息场景的相位和振幅，而不需要纯相位全息术所需的迭代算法。我们展示了具有独立和完全控制振幅和相位的全介质超表面全息图，同时在两个光学频率下产生二维和三维全息物体。我们证明了相位-振幅超表面能够实现在纯相位全息中无法实现的一些特征；这些包括创建无伪影的二维全息图像，在物体平面上分别编码相位和振幅轮廓，在超表面和物体平面上分别编码强度轮廓，以及控制三维全息物体的表面纹理。
Metasurfaces are optically thin metamaterials that promise complete control of the wavefront of light but are primarily used to control only the phase of light. Here, we present an approach, simple in concept and in practice, that uses meta-atoms with a varying degree of form birefringence and rotation angles to create high-efficiency dielectric metasurfaces that control both the optical amplitude and phase at one or two frequencies. This opens up applications in computer-generated holography, allowing faithful reproduction of both the phase and amplitude of a target holographic scene without the iterative algorithms required in phase-only holography. We demonstrate all-dielectric metasurface holograms with independent and complete control of the amplitude and phase at up to two optical frequencies simultaneously to generate two- and three-dimensional holographic objects. We show that phase-amplitude metasurfaces enable a few features not attainable in phase-only holography; these include creating artifact-free two-dimensional holographic images, encoding phase and amplitude profiles separately at the object plane, encoding intensity profiles at the metasurface and object planes separately, and controlling the surface textures of three-dimensional holographic objects.