Generation of orbital angular momentum and focused beams with tri-layer medium metamaterial
Zhi-Chao Sun(孙志超), Meng-Yao Yan(闫梦瑶), Bi-Jun Xu(徐弼军)
中国物理B . 2020, (10): 104101 .  DOI: 10.1088/1674-1056/abab79