Title:
Modeling high-order plasmon resonances of a U-shaped nanowire used to build a negative-index metamaterial
Author(s):
Francisco J. Rodríguez-Fortuño, Carlos García-Meca, Rubén Ortuño, Javier Martí, and Alejandro Martínez
Source:
Vol./Issue/Date:
06.02.2009
Year:
2006
Page(s):
075103-1 -075103-10
Keywords:
Abstract:
We apply the concept of slow surface-plasmon polariton standing-wave resonances to model the plasmon
resonances which exist on split-ring resonators U-shaped nanowires forming the unit cell of a metamaterial
at infrared frequencies. We compare the expected resonances predicted by the model with full electrodynamic
three-dimensional simulations of the U-shaped nanowires for varying geometrical parameters and find a reasonably
good agreement. We also consider how far-field dipolar coupling between unit-cells and near-field
coupling between the U-shaped nanowire’s arms should be taken into account. In addition, we study how the
different resonances give rise to negative constitutive parameters for the metamaterial and adjust the geometrical
parameters so that the second and third order slow-SPP standing-wave resonances of the U-shaped nanowires
result in a double-negative behavior at far-infrared wavelengths without the need of further wires or
particles. Finally, we study the effects of stacking N layers of such metamaterial, where each resonant mode
splits into N normal mode resonances, showing different electric or magnetic responses. This simple stacked
structure maintains the left-handed behavior, exhibiting backward wave propagation.
Document:
Reference Id:
422
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