Multifunctional Geometric Metasurfaces Based on Tri‐Spectral Meta‐Atoms with Completely Independent Phase Modulations at Three Wavelengths,Advanced Theory and Simulations

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Multifunctional Geometric Metasurfaces Based on Tri‐Spectral Meta‐Atoms with Completely Independent Phase Modulations at Three Wavelengths
Advanced Theory and Simulations ( IF 2.9 ) Pub Date : 2020-08-13 , DOI: 10.1002/adts.202000099
Rensheng Xie ₁ , Guohua Zhai ₁ , Jianjun Gao ₁ , Dajun Zhang ₂ , Xiong Wang ₂ , Sensong An ₃ , Bowen Zheng ₃ , Hualiang Zhang ₃ , Jun Ding ₁

Affiliation

Metasurface has drawn much attention due to its unprecedented wave‐front manipulation abilities with an ultrathin flat profile. However, the metasurface as a diffractive device usually suffers from chromatic aberrations, which greatly hinders the design freedom at different wavelengths. In this work, it is demonstrated that this limitation can be overcome by a multifunctional metasurface with completely independent phase modulations at three arbitrarily wavelengths. Specifically, a novel single‐layer tri‐spectral meta‐atom composed of three alternatively arranged slot and metallic resonators is proposed to operate at three distinct wavelengths, where 2π geometric phase modulations under the circularly polarized incidence can be achieved independently by rotating the corresponding resonators. As proof of concept demonstrations, a tri‐wavelength vortex beam generator and a meta‐hologram are designed to verify the proposed method. First, a vortex beam generator with arbitrary topological charge numbers at three wavelengths is designed and verified through theoretical calculation and full‐wave simulation. Moreover, a meta‐hologram generated by the computer‐generated holography is designed to display three frequency selective holographic images on the same image plane. The tri‐wavelength meta‐hologram is validated through theoretical calculation, full‐wave simulation, and experiment. The experimental results agree very well with the numerical ones, demonstrating the attractive capabilities of multifunctionalities at three wavelengths.

中文翻译：

基于三光谱元原子的，在三个波长上具有完全独立的相位调制的多功能几何元表面

超颖表面由于其前所未有的波前操纵能力和超薄的平面轮廓而备受关注。然而，作为衍射器件的超表面通常遭受色差，这极大地阻碍了在不同波长下的设计自由度。在这项工作中，证明了可以通过在三个任意波长上具有完全独立的相位调制的多功能超表面来克服此限制。具体而言，提出了一种新颖的由三个交替布置的缝隙和金属谐振器组成的单层三光谱亚原子，它们可以在三个不同的波长下工作，其中通过旋转相应的谐振器可以独立地在圆偏振入射下实现2π几何相位调制。作为概念演示的证明，设计了三波长涡旋光束发生器和亚全息图以验证所提出的方法。首先，设计并通过理论计算和全波仿真验证了在三个波长处具有任意拓扑电荷数的涡旋束发生器。此外，由计算机生成的全息图生成的元全息图被设计为在同一图像平面上显示三个频率选择性全息图图像。通过理论计算，全波模拟和实验对三波长亚全息图进行了验证。实验结果与数值结果非常吻合，证明了在三种波长下多功能的吸引力。设计并通过理论计算和全波仿真设计并验证了在三个波长处具有任意拓扑电荷数的涡旋束发生器。此外，由计算机生成的全息图生成的元全息图被设计为在同一图像平面上显示三个频率选择性全息图图像。通过理论计算，全波模拟和实验对三波长亚全息图进行了验证。实验结果与数值结果非常吻合，证明了在三种波长下多功能的吸引力。设计并通过理论计算和全波仿真设计并验证了在三个波长处具有任意拓扑电荷数的涡旋束发生器。此外，由计算机生成的全息图生成的元全息图被设计为在同一图像平面上显示三个频率选择性全息图图像。通过理论计算，全波模拟和实验对三波长亚全息图进行了验证。实验结果与数值结果非常吻合，证明了在三种波长下多功能的吸引力。由计算机生成的全息图生成的元全息图旨在在同一图像平面上显示三个频率选择性全息图图像。通过理论计算，全波模拟和实验对三波长亚全息图进行了验证。实验结果与数值结果非常吻合，证明了在三种波长下多功能的吸引力。由计算机生成的全息图生成的元全息图旨在在同一图像平面上显示三个频率选择性全息图图像。通过理论计算，全波模拟和实验对三波长亚全息图进行了验证。实验结果与数值结果非常吻合，证明了在三种波长下多功能的吸引力。

更新日期：2020-09-23

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