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(a) Schematic of the unit cell of the 3D SCR metamaterials under consideration . The dimensions of the fabricated structure are ax = ay = 8.0 μm, az = 9.1 μm, w1 = 600 nm, and w2 = 850 nm, respectively. The wave propagation is along the z direction. (b) Top view of SEM image of the 3D SCR metamaterial, recorded at 15 kV. The magnification scale can be seen below the SEM image.
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