Metallic Waveguide Arrays for Metasurface‐Like Control with High Simplicity in Design,Advanced Optical Materials

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Metallic Waveguide Arrays for Metasurface‐Like Control with High Simplicity in Design
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2020-06-15 , DOI: 10.1002/adom.202000605
Huawei Liang ₁ , Jiaqi Li ₁ , Zhiyong Wu ₁ , Lei Zhang ₂ , Shuangchen Ruan ₁

Affiliation

Metallic waveguide arrays, consisting of regularly arranged holes, are proposed for metasurface‐like control of phase, polarization, and amplitude, while the design procedure is greatly simplified. In a sharp contrast to the existing metasurface working principles, the phase delay is dependent on the waveguide dimension perpendicular to the polarization direction, but not on the dimension parallel to the polarization direction. Due to the negligible cross‐polarization effect, the phase can be completely independently controlled for two orthogonally polarized waves with either the same or the different frequencies using one waveguide array. Notably, the analytical relationship between the phase delay and hole dimensions can be presented explicitly, which greatly simplifies the design process to select the waveguide array for a desired phase distribution. Furthermore, the amplitude and polarization can be completely controlled by tuning the dimension and the orientation angle of metal holes. Based on the control over phase, polarization, and amplitude, several control functionalities are theoretically and experimentally demonstrated at the terahertz frequency. A control efficiency of up to 70% is experimentally obtained. The freestanding waveguide array with features of both easy availability and high durability may significantly push forward the development of various photonic devices.

中文翻译：

金属波导阵列，用于设计超简单的超表面控制

提出了由规则排列的孔组成的金属波导阵列，用于相位，极化和幅度的超表面控制，同时大大简化了设计过程。与现有的超表面工作原理形成鲜明对比的是，相位延迟取决于垂直于偏振方向的波导尺寸，而不取决于平行于偏振方向的尺寸。由于交叉极化效应可忽略不计，因此可以使用一个波导阵列对具有相同或不同频率的两个正交极化波完全独立地控制相位。值得注意的是，相位延迟和孔尺寸之间的解析关系可以明确表示，这极大地简化了选择波导阵列以获得所需相位分布的设计过程。此外，可以通过调整金属孔的尺寸和方向角来完全控制振幅和极化。基于对相位，极化和幅度的控制，在太赫兹频率下在理论和实验上演示了几种控制功能。实验上可获得高达70％的控制效率。具有易于使用和高耐用性的独立式波导阵列可以显着地推动各种光子器件的开发。理论上和实验上以太赫兹频率演示了几种控制功能。实验上可获得高达70％的控制效率。具有易于使用和高耐用性的独立式波导阵列可以显着地推动各种光子器件的开发。理论上和实验上以太赫兹频率演示了几种控制功能。实验上可获得高达70％的控制效率。具有易于使用和高耐用性的独立式波导阵列可以显着推动各种光子器件的开发。

更新日期：2020-06-15

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