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(Left) designed unit cell, with geometries: , , , , , , , and . (Right) Photomicrograph of the fabricated sample. The lattice constant of the unit cell is .
(a) Calculated (blue line) and measured (red line) transmissions of the metamaterial sample. (b) Retrieved permittivity of the metamaterial layer.
(a) Single-resonant particles SR1, SR2, SR3, and dual-resonant particle DR (, , and ). (b) Calculated transmission of the metamaterial composed of SR1, SR2, SR3 (pink, red, and green dashed lines, respectively), and DR (blue solid line).
(Left) Near the first resonance, the resonant particle part (upper part) induces the same-direction circular surface current on the nonresonant part (lower part). (Right) Near the second resonance, the resonant particle part (lower part) induces the opposite-direction circular surface current on the nonresonant part (upper part). The wave polarization is shown, and white and black arrows denote the surface current directions and the dipole moments in the gaps, respectively.
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