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. 2015 Apr 15;5:9605. doi: 10.1038/srep09605

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(a) The schematic of metasurface, which can be composed of only “period 1” or the combination of both “period 1” and “period 2”. (b) The front view of the anisotropic unit cell, which is composed of two orthogonal I-shaped structures. (c) The side view of the anisotropic unit cell, which shows that the metal-grounded plane and the I-shaped structures are spaced by a dielectric isolator. (d) The phase responses of the anisotropic unit cell, which show that the reflection phase of E_x (see blue dashed line) will not be affected by the length changing of l_y but the reflection phase of E_y (see black solid line) is decreased gradually from 130° to −200° when l_y is increased from 2 mm to 5 mm.