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(a) Unit cell of the single-layered cut wires metasurface. The geometrical dimensions of the unit cell are: ax = 20 mm, ay = 6 mm, lx = 19.6 mm, w = 0.3 mm and d = 0.4 mm, (b) unit cell of the single-layered Z metasurface. The geometrical dimensions of the unit cell are: ax = ay = 6 mm, lx = 5.8 mm, ly = 5.7 mm, w = 0.3 mm and d = 0.4 mm, (c) simulated transmission response of the cut wires metasurface under normal incidence, (d) simulated transmission responses under normal and oblique incidence of the single-layered Z metasurface in H-plane, (e) charge distribution at the fundamental (m0) resonance of the cut wires structure. Dark mode is not excited under normal incidence due to a zero net dipolar momentum, (f) charge distribution at the fundamental (m0) and first higher order (m1) resonances of the Z structure. Under normal incidence, there is no creation of dipolar magnetic momentum and therefore dark mode is not excited. However under off-normal incidence, magnetic field excitation occurs and currents flow in opposite direction in the Z structure, creating a magnetic momentum and exciting the dark mode.
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