Overcome chromatism of metasurface via Greedy Algorithm empowered by self-organizing map neural network - Zhu, Ruichao; Wang, Jiafu; Qiu, Tianshuo; Sui, Sai; Han, Yajuan; Jia, Yuxiang; Li, Yongfeng; Yan, Mingbao; Pang, Yongqiang; Xu, Zhuo; Qu, Shaobo (Optics express, 2020)