Reflectionless spatial beam benders with arbitrary bending angle by introducing optic-null medium into transformation optics
Fei Sun(孙非), Yi-Chao Liu(刘一超), Yi-Biao Yang(杨毅彪), Hong-Ming Fei(费宏明), Zhi-Hui Chen(陈智辉), and Sai-Ling He(何赛灵)
中国物理B . 2021, (3): 34101 .  DOI: 10.1088/1674-1056/abd38b