Luo Xian-Gang, Pu Ming-Bo, Li Xiong, Ma Xiao-Liang
State Key Laboratory of Optical Technologies on Nano-Fabrication and Micro-Engineering, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China.
Light Sci Appl. 2017 Jun 16;6(6):e16276. doi: 10.1038/lsa.2016.276. eCollection 2017 Jun.
With properties not previously available, optical metamaterials and metasurfaces have shown their great potential in the precise control of light waves at the nanoscale. However, the use of current metamaterials and metasurfaces is limited by the collective response of the meta-atoms/molecules, which means that a single element cannot provide the functionalities required by most applications. Here, we demonstrate for the first time that a single achiral nanoaperture can be utilized as a meta-macromolecule to achieve giant angular spin Hall effect of light. By controlling the spin-related momenta, we show that these nanoapertures can enable full control of the phase gradient at a deep-subwavelength level, thus forming unique building blocks for optical metasurfaces. As a proof-of-concept demonstration, a miniaturized Bessel-like beam generator and flat lens are designed and experimentally characterized. The results presented here may open a door for the development of meta-macromolecule-based metasurfaces for integrated optical systems and nanophotonics.
光学超材料和超表面具有前所未有的特性，在纳米尺度上对光波的精确控制方面展现出了巨大潜力。然而，当前超材料和超表面的应用受到超原子/分子集体响应的限制，这意味着单个元件无法提供大多数应用所需的功能。在此，我们首次证明单个非手性纳米孔径可被用作超大分子，以实现光的巨大角自旋霍尔效应。通过控制与自旋相关的动量，我们表明这些纳米孔径能够在深亚波长水平上实现对相位梯度的完全控制，从而为光学超表面形成独特的构建模块。作为概念验证演示，设计并通过实验表征了一个小型化的类贝塞尔光束发生器和平板透镜。本文给出的结果可能为基于超大分子的超表面在集成光学系统和纳米光子学中的发展打开一扇门。
