A Direct Near-Field Observation of Conversion Between Waveguide Modes and Leaky Modes in Periodic Metal Structures. - Chia Ho Wu; Zhenyu Qian; Wei Wang; Jianqi Shen; Xianqing Lin; Li-Yi Zheng; Fang He; Xiaolong Wang; Zhuoyuan Wang; Song Tsuen Peng; Guobing Zhou; Linfang Shen; et al. (IEEE Access, 2023)