Enlarged negative effective index bandwidth from fishnet metamaterials

R. Ortuño; C. García-Meca; F. J. Rodríguez-Fortuño; J. Martí; A. Martínez

doi:10.1117/12.854535

29 April 2010 Enlarged negative effective index bandwidth from fishnet metamaterials

R. Ortuño, C. García-Meca, F. J. Rodríguez-Fortuño, J. Martí, A. Martínez

Proceedings Volume 7711, Metamaterials V; 771108 (2010) https://doi.org/10.1117/12.854535
Event: SPIE Photonics Europe, 2010, Brussels, Belgium

Abstract

Exploiting the concept of internal surface plasmon polariton (I-SPP) resonances, which appear at non-single metallic film stacks, we have designed a metamaterial showing a negative effective refractive index within a large bandwidth. The designed structure consists of an arrangement of several fishnet layers. By properly adjusting the lattice constant 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 effective refractive index. Thus, the combination of several fishnet layers, each one of them configured to excite an I-SPP at a different frequency, enables us to extend the bandwidth at which a negative effective refractive index is achieved, as long as the selected resonances are close enough. Specifically, from a subwavelength chain of two fishnet layers, the retrieved effective parameters show a negative index behavior in a frequency span of about 44THz centered at 210THz, owing to the fact that an I-SPP is excited in each fishnet layer at slightly different frequencies.

Citation Download Citation

R. Ortuño, C. García-Meca, F. J. Rodríguez-Fortuño, J. Martí, and A. Martínez "Enlarged negative effective index bandwidth from fishnet metamaterials", Proc. SPIE 7711, Metamaterials V, 771108 (29 April 2010); https://doi.org/10.1117/12.854535

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