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Tunable figure of merit for a negative-index metamaterial with a sandwich configuration

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Abstract

Metamaterials with a free-standing Ag–SU-8–Ag sandwich configuration, perforated with a periodic array of cross-dipole apertures, are fabricated. The transmittance spectra of both experiment and simulation have indicated the existence of two transmission bands in mid-IR frequencies. The high-frequency transmission peak is the guided mode associated with the surface plasmon polariton (SPP), and its location strongly depends on the arm length of the cross-dipole. The lower-frequency transmission peak is proposed to be the antisymmetric plasmon polariton mode, and its location hardly shifts as the size of the cross-dipole varies. Numerical simulations indicate that, on increasing the arm length of the cross-dipole aperture, the coaction of the electric dipole-like mode and the SPP-associated guided mode results in a better figure of merit.

© 2009 Optical Society of America

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