Sui Sai, Ma Hua, Lv Yueguang, Wang Jiafu, Li Zhiqiang, Zhang Jieqiu, Xu Zhuo, Qu Shaobo
Opt Express. 2018 Jan 22;26(2):1443-1451. doi: 10.1364/OE.26.001443.
Arbitrary control of electromagnetic waves remains a significant challenge although it promises many important applications. Here, we proposed a fast optimization method of designing a wideband metasurface without using the Pancharatnam-Berry (PB) phase, of which the elements are non-absorptive and capable of predicting the wideband and smooth phase-shift. In our design method, the metasurface is composed of low-Q-factor resonant elements without using the PB phase, and is optimized by the genetic algorithm and nonlinear fitting method, having the advantages that the far field scattering patterns can be quickly synthesized by the hybrid array patterns. To validate the design method, a wideband low radar cross section metasurface is demonstrated, showing good feasibility and performance of wideband RCS reduction. This work reveals an opportunity arising from a metasurface in effective manipulation of microwave and flexible fast optimal design method.
尽管对电磁波的任意控制有望带来许多重要应用，但它仍然是一项重大挑战。在此，我们提出了一种快速优化方法，用于设计一种不使用潘查拉特纳姆 - 贝里（PB）相位的宽带超表面，其单元是非吸收性的，并且能够预测宽带且平滑的相移。在我们的设计方法中，超表面由不使用PB相位的低品质因数谐振单元组成，并通过遗传算法和非线性拟合方法进行优化，具有可以通过混合阵列方向图快速合成远场散射方向图的优点。为了验证该设计方法，展示了一种宽带低雷达散射截面超表面，显示出宽带雷达散射截面减小的良好可行性和性能。这项工作揭示了超表面在有效操控微波方面带来的机遇以及灵活的快速优化设计方法。
