近日，东南大学的崔铁军&程强及其研究团队取得一项新进展。经过不懈努力，他们利用可编程超表面实现以线性和非线性方式任意旋转偏振方向和操纵相位。相关研究成果已于2024年7月18日在国际知名学术期刊《光：科学与应用》上发表。

该研究团队提出一种利用堆叠可编程超表面以线性和非线性方式任意控制反射波偏振方向和相位的方法。此外，研究人员扩展了时空编码理论，将偏振维度纳入其中，这为操纵电磁波提供了额外的自由度。作为原理验证的应用实例，研究人员考虑了线性和非线性频率下的偏振旋转、相位操纵和光束导引。

为了验证，研究人员设计、制造和测量了一个超表面样品。实验结果与理论预测和仿真结果吻合较好。该方法在成像、数据存储和无线通信等领域具有广泛的应用前景。

据悉，在广泛的应用中，对电磁波各种特性的独立控制是至关重要的。可编程超表面是一个很有前途的候选，为操纵电磁波提供了一个先进的平台。

附：英文原文

Title: Arbitrarily rotating polarization direction and manipulating phases in linear and nonlinear ways using programmable metasurface

Author: Liu, Wei, Wang, Si Ran, Dai, Jun Yan, Zhang, Lei, Chen, Qiao, Cheng, Qiang, Cui, Tie Jun

Issue&Volume: 2024-07-18

Abstract: Independent controls of various properties of electromagnetic (EM) waves are crucially required in a wide range of applications. Programmable metasurface is a promising candidate to provide an advanced platform for manipulating EM waves. Here, we propose an approach that can arbitrarily control the polarization direction and phases of reflected waves in linear and nonlinear ways using a stacked programmable metasurface. Further, we extend the space-time-coding theory to incorporate the dimension of polarization, which provides an extra degree of freedom for manipulating EM waves. As proof-of-principle application examples, we consider polarization rotation, phase manipulation, and beam steering at linear and nonlinear frequencies. For validation, we design, fabricate, and measure a metasurface sample. The experimental results show good agreement with theoretical predictions and simulations. The proposed approach has a wide range of applications in various areas, such as imaging, data storage, and wireless communication.

DOI: 10.1038/s41377-024-01513-2

Source: https://www.nature.com/articles/s41377-024-01513-2