Zhang Haochen, Zhang Zuojun, Ma XIaoliang, Pu Mingbo, Li Xiong, Guo Yinghui, Luo Xiangang
Opt Express. 2022 Mar 28;30(7):12069-12079. doi: 10.1364/OE.454805.
We propose a dual-band achromatic focusing metasurface based on polarization multiplexing and dispersion engineering. An anisotropic resonant phase meta-atom is designed to realize independent nonlinear phase manipulation along the orthogonal directions. Achromatic focusing metasurface and broadband reflectarray antenna are further constructed in the microwave region with a computer-assisted particle swarm optimization algorithm. The standard deviation of focus offset at 11-16 GHz (for x-polarization) and 18-24 GHz (for y-polarization) are compressed to 19.83% and 16.60% of the dispersive metasurface, respectively. The radiation gains of the reflectarray antenna increase by an average of 19.49 dB and 15.08 dB in the broadband region compared with the bare standard rectangle waveguides. Furthermore, such an achromatic metasurface can be utilized to realize different functions with polarization selectivity and applied to other frequency ranges, which holds great promise in integrated optics.
我们提出了一种基于偏振复用和色散工程的双波段消色差聚焦超表面。设计了一种各向异性谐振相位元原子，以实现沿正交方向的独立非线性相位操纵。利用计算机辅助粒子群优化算法，在微波区域进一步构建了消色差聚焦超表面和宽带反射阵列天线。在11-16GHz（x偏振）和18-24GHz（y偏振）处，聚焦偏移的标准偏差分别压缩至色散超表面的19.83%和16.60%。与裸标准矩形波导相比，反射阵列天线在宽带区域的辐射增益平均增加了19.49dB和15.08dB。此外，这种消色差超表面可用于实现具有偏振选择性的不同功能，并应用于其他频率范围，在集成光学领域具有广阔前景。
