Tunable lithium niobate metasurfaces for phase-only modulation based on quasi-bound states in the continuum
摘要
We have proposed and theoretically analyzed an electro-tunable extreme Huygens’ BIC metasurface consisting of LiNbO3 elliptical cylinders. After optimizing the geometry parameter of the structure, we have realized over 2π phase retardation of transmitted light while maintaining over 96% transmission amplitude. The metasurface can be continuously tuned based on the EO property of the LiNbO3 without a drastic change in the transmission. The proposed LiNbO3 metasurface will be a good candidate for developing reconfigurable optical components in optical wavefront shaping, displaying, and other applications.