Abstract
In this paper, we present a multifunctional metasurface enabling terahertz focusing for efficient terahertz wave control. Due to the sensitive response of two orthogonal electric dipoles to polarization direction of the terahertz wave, phase distributions on the metasurface can be efficiently controlled in both vertical and horizontal directions. Therefore, two different focal distances can be achieved under a normal incident wave with two different linear polarization. Further, the incident waves will form vertical or parallel axial focus with p(x) or s(y)-polarized component. In addition, this design method can be applied to other terahertz multifunctional devices which develops diversifications of the metasurface.
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