Selective Diffraction with Complex Amplitude Modulation by Dielectric Metasurfaces,Advanced Optical Materials

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Selective Diffraction with Complex Amplitude Modulation by Dielectric Metasurfaces
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2018-01-04 , DOI: 10.1002/adom.201701181
Xu Song ₁ , Lingling Huang _{1,

2} , Chengchun Tang _{3,

4} , Junjie Li _{3,

4} , Xiaowei Li ₅ , Juan Liu ₁ , Yongtian Wang ₁ , Thomas Zentgraf ₂

Affiliation

Metasurfaces have attracted extensive interest due to their ability to locally manipulate optical parameters of light and easy integration to complex optical systems. Particularly, metasurfaces can provide a novel platform for splitting and diffracting light into several beams with desired profile, which is in contrast to traditional gratings. Here, a novel method for generating independently selective diffraction orders is proposed and demonstrated. This method is based on complex amplitude modulation with ultrathin dielectric metasurfaces. By tailoring the geometric parameters of silicon nanofin structures, the geometric and dynamic phase as well as the amplitude simultaneously can be controlled spatially. The results are compared with a metasurface that uses a phase‐only modulation, to verify such selective diffraction can be solely efficiently achieved with complex amplitude modulation. Besides, the diffraction angles of each order have been measured, which are consistent with standard grating theory. The method developed for achieving selective diffraction with metasurfaces has potential applications in beam shaping, parallel laser fabrication, and nanoscale optical detection.

中文翻译：

介电超表面的复杂振幅调制的选择性衍射

由于超表面能够局部操纵光的光学参数并易于集成到复杂的光学系统中，因此它们引起了广泛的兴趣。特别地，与传统光栅相反，超表面可以提供一种新颖的平台，用于将光分裂和衍射成具有所需轮廓的多个光束。在此，提出并证明了一种用于产生独立的选择性衍射级的新颖方法。该方法基于具有超薄介电超表面的复杂幅度调制。通过调整硅纳米鳍结构的几何参数，可以同时在空间上控制几何和动态相位以及振幅。将结果与使用仅相位调制的超颖表面进行比较，验证这种选择性衍射可以通过复杂的振幅调制单独有效地实现。此外，已经测量了每个阶的衍射角，这与标准光栅理论是一致的。为实现超颖表面的选择性衍射而开发的方法在光束整形，并行激光制造和纳米级光学检测中具有潜在的应用。

更新日期：2018-01-04

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