Abstract

This work demonstrates the angular dependence of dual-band negative-index materials implemented by elliptical nanohole arrays (ENAs) consisting of an ${\mathrm{Al}}_2{\mathrm{O}}_3$ dielectric layer between two Au films. This article, it is believed for the first time, analyzes the scattering coefficients and displacement current of the ENA at different angles of plane-wave incidence to show that the ENA is double negative (showing both a negative effective permeability ${\mu }_{\text{eff}}$ and a negative effective permittivity ${\epsilon }_{\text{eff}}$) at multiple wavelengths (1095 and 1680 nm) for $p$ polarization over a broad range of incident angles.

©2012 Optical Society of America

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