On Metalenses with Arbitrarily Wide Field of View
On Metalenses with Arbitrarily Wide Field of View
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DOI：
10.1021/acsphotonics.0c00479
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发表时间：
2020-08-19
期刊：
影响因子：
7
通讯作者：
Martins, Emiliano R.
中科院分区：
文献类型：
--
作者：
Martins, Augusto;Li, Kezheng;Martins, Emiliano R.
金属透镜是模仿光学元件功能的纳米结构表面。已经进行了许多令人兴奋的演示，例如，聚焦到衍射限制的光斑或在宽波长范围内的消色差操作。然而，目前还没有的关键功能，也是对智能手机或虚拟现实等应用程序最重要的功能，是在大范围内使用单个元素执行成像功能的能力。在这里，通过放宽对衍射限制分辨率的限制，我们展示了单层金属透镜在保持适用于大多数应用的高分辨率的同时执行大视场(WFoV)成像的能力。我们还讨论了WFoV的物理性质，特别是我们证明了这种WFoV金属透镜在无限半径和无限折射率的极限下模拟了球面透镜。最后，我们用傅里叶分析解释了视场对数值孔径的依赖关系。
Metalenses are nanostructured surfaces that mimic the functionality of optical elements. Many exciting demonstrations have already been made, for example, focusing into diffraction-limited spots or achromatic operation over a wide wavelength range. The key functionality that is yet missing, however, and that is most important for applications such as smartphones or virtual reality, is the ability to perform the imaging function with a single element over a wide field of view. Here, by relaxing the constraint on diffraction-limited resolution, we demonstrate the ability of single-layer metalenses to perform wide field of view (WFOV) imaging while maintaining high resolution suitable for most applications. We also discuss the WFOV physical properties and, in particular, we show that such a WFOV metalens mimics a spherical lens in the limit of infinite radius and infinite refractive index. Finally, we use Fourier analysis to explain the dependence of the FOV on the numerical aperture.