Nonlinear metamaterials for holography.
Nonlinear metamaterials for holography.
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DOI：
10.1038/ncomms12533
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发表时间：
2016-08-22
影响因子：
16.6
通讯作者：
Prior Y
中科院分区：
文献类型：
--
作者：
Almeida E;Bitton O;Prior Y
全息图是存储相位和可能的振幅信息的光学元件，其使得能够通过相干光束的照射和散射来重建物体的三维图像，并且图像在与输入激光束相同的波长下生成。近年来，研究表明，信息可以存储在纳米天线中，从而产生纳米组件。在这里，我们展示了非线性多层超材料全息图。在一个新的频率-照明光束的第三谐波下形成无背景图像。利用多层等离子体纳米天线的电子束光刻，我们制作了偏振敏感的非线性元件，如闪耀光栅，透镜和其他计算机生成的全息图。这些全息图进行了分析，并讨论了未来设备的应用前景。 相位超颖表面已经扩展到非线性区域，使得能够在一个薄元件中相干产生、光束转向和光束透镜化。在这里，Almeida等人展示了一种非线性多层超材料全息图，其在照明光束的第三谐波频率下生成图像。
A hologram is an optical element storing phase and possibly amplitude information enabling the reconstruction of a three-dimensional image of an object by illumination and scattering of a coherent beam of light, and the image is generated at the same wavelength as the input laser beam. In recent years, it was shown that information can be stored in nanometric antennas giving rise to ultrathin components. Here we demonstrate nonlinear multilayer metamaterial holograms. A background free image is formed at a new frequency—the third harmonic of the illuminating beam. Using e-beam lithography of multilayer plasmonic nanoantennas, we fabricate polarization-sensitive nonlinear elements such as blazed gratings, lenses and other computer-generated holograms. These holograms are analysed and prospects for future device applications are discussed. Phased metasurfaces have been extended to the nonlinear regime, enabling coherent generation, beam steering and lensing of light beams in one thin element. Here, Almeida et al. demonstrate a nonlinear multilayer metamaterial hologram generating images at the third harmonic frequency of the illuminating beam.