Zhuang Yaqiang, Si Liming, Huang Hailin, Cai Tong
Opt Express. 2024 Aug 26;32(18):31325-31333. doi: 10.1364/OE.532157.
This paper presents a highly efficient Airy beam generator at microwave frequency using a transparent metasurface with a receiving-transmitting scheme. The amplitude and phase of the transmitted orthogonal polarization wave can be flexibly controlled by orientation angles of receiving and transmitting patches of the proposed meta-atom. Utilizing this property to reshape the field of transmitted waves following the desired phase and amplitude profile of the Airy wave packet, an Airy beam generator is designed and experimentally demonstrated. Simulation and measurement results both show a self-healing Airy beam with an efficiency of 23.5% and polarization purity above 20 dB, which approaches the theoretical limitation of the designed Airy beam. Due to the well-performed beam efficiency and polarization purity resulting from the receiving-transmitting metasurface, our design holds great promise for efficient wavefront shaping and facilitates the use of high-purity Airy beams for practical applications.
本文提出了一种利用具有收发方案的透明超表面在微波频率下实现的高效艾里光束发生器。所提出的超原子的接收和发射贴片的取向角可以灵活地控制透射正交极化波的幅度和相位。利用这一特性，按照艾里波包所需的相位和幅度分布来重塑透射波场，设计并通过实验验证了一种艾里光束发生器。仿真和测量结果均显示出一种自愈艾里光束，其效率为23.5%，偏振纯度高于20 dB，接近所设计艾里光束的理论极限。由于收发超表面具有良好的光束效率和偏振纯度，我们的设计在高效波前整形方面具有很大的潜力，并有助于将高纯度艾里光束用于实际应用。
