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Proceedings Paper

Enlarged negative effective index bandwidth from fishnet metamaterials
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Paper 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.

Paper Details

Date Published: 29 April 2010
PDF: 8 pages
Proc. SPIE 7711, Metamaterials V, 771108 (29 April 2010); doi: 10.1117/12.854535
Show Author Affiliations
R. Ortuño, Univ. Politécnica de Valencia (Spain)
C. García-Meca, Univ. Politécnica de Valencia (Spain)
F. J. Rodríguez-Fortuño, Univ. Politécnica de Valencia (Spain)
J. Martí, Univ. Politécnica de Valencia (Spain)
A. Martínez, Univ. Politécnica de Valencia (Spain)

Published in SPIE Proceedings Vol. 7711:
Metamaterials V
Nigel P. Johnson; Ekmel Özbay; Richard W. Ziolkowski; Nikolay I. Zheludev, Editor(s)

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