Enlarging the negative-index bandwidth of optical metamaterials by hybridized plasmon resonances |
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Authors: | Ortu?o R García-Meca C Rodríguez-Fortu?o F J Martínez A |
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Affiliation: | Nanophotonics Technology Center, Universidad Politécnica de Valencia, 46022 Valencia, Spain. ruormo@ntc.upv.es |
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Abstract: | By exploiting the concept of internal surface plasmon polariton (I-SPP) resonances, which appear at nonsingle metallic film stacks, we have designed a metamaterial showing a negative effective index within a large frequency bandwidth. The designed structure consists of an arrangement of several fishnet layers. By properly adjusting the lattice and the thickness of the dielectric slab of the fishnet, an I-SPP mode can be excited at a certain frequency, giving rise to a negative permeability. Thus, when combining several fishnet layers, each one configured to excite an I-SPP at a slightly different frequency, the coupling among the fishnet layers will cause a plasmon hybridization effect that enables us to extend the negative-index bandwidth. |
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