Frequency-dependent bifunctional metasurface at terahertz frequencies

In this paper, we proposed a bifunctional metasurface with the capability to achieve anomalous reflection and transmission at two assigned terahertz (THz) frequencies simultaneously. The unit cell of the metasurface is composed of a C-shaped split-ring resonator and a complementary C-shaped split-ring resonator separated by a dielectric spacer, which could be utilized to realize frequency-dependent multi-functional devices. A one-dimensional deflector that can work at both transmissive and reflective modes is designed and demonstrated to prove the frequency-dependent performance.