Abstract
Phase-gradient metagratings have exhibited unconventional abilities to manipulate electromagnetic waves owing to functionality inherited from metasurface and different physics. In this paper, by integrating homogeneous dielectric materials with gradient thickness into periodical metallic slits, a passive phased metagrating based on mode conversion is designed in which each unit provides nearly perfect broadband transmission. To validate the effectiveness of our scheme, anomalous scattering and planar metalenses with excellent efficiency in a finite band are designed theoretically and proved numerically. Good performance makes the implementation of other metasurface functions possible, providing a platform for functions from holography to caustic engineering. More interestingly, the high fluidity of this structure promises potential application in other physical fields, such as acoustics and water waves.
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