Yang, ShijunLi, YanfengChen, XieyuYang, QuanlongHan, JiaguangZhang, Weili2023-05-150146-9592http://hdl.handle.net/1885/291040Chiral metamaterials have attracted wide interest because strong optical activity at designed frequencies could be achieved beyond that in natural materials. Here we propose an all-dielectric metamaterial with strong extrinsic circular dichroism and circular birefringence by periodically arranging symmetry-broken dielectric Mie resonators at terahertz frequencies. The strong interaction between the electric and magnetic resonances from circularly polarized incident waves dominates the performance of the all-dielectric metamaterial, which exhibits a 60% circular dichroism in transmission and a polarization rotation angle of 60◦ at maximum, respectively. Additionally, the spectral range of the circular dichroism with preserved amplitude can be adjusted continuously in the frequency range from 0.67-0.79 THz by tuning the tilt angle of the incident wave. Our findings will be of great potential in polarization control applications such as asymmetric transmission, optical isolation, and on-chip chiral manipulation.National Key Research and Development Program of China (2017YFA0701004); National Natural Science Foundation of China (61605143, 61722509, 61735012, 61871212, 61875150, 61935015); Tianjin Municipal Fund for Distinguished Young Scholars (18JCJQJC45600).application/pdfen-AU© 2020 Optical Society of America202010.1364/OL.4033772022-03-13