In a silicon metasurface, planar chiral mode with circular dichroism 0.37 and Q factor 1220 was experimentally observed under normal incidence by breaking the periodic symmetry. Li Guangyuan from the Shenzhen Institute of Advanced Technology (SIAT) of the Chinese Academy of Sciences experimentally demonstrated that anisotropic lattice could induce strong chirality in metasurfaces. In a study published in Laser & Photonics Reviews, a research group led by Dr. In many applications of chiral nanophotonics such as biochemical chiral sensing, chiral emission or lasing, and chiral nonlinear responses, strong optical chirality simultaneously with high Q factors are highly desirable but challenging to achieve.