Nickel-Copper Multilayer Metamaterials

Abstract

Plasmonic metamaterials are able to shape optical space in ways rarely or never found in nature. As such plasmonic metamaterials are used as superlenses, superabsorbers, refractometric sensors, invisibility shields, etc. [1]. Responsible for these unique properties are Surface Plasmon Polaritons (SPP), surface waves propagating along interfaces between materials with different signs of relative dielectric permittivity [2]. Most metals are good conductors and posses intrinsic free electron plasma which allows for negative relative permittivity. However, despite wide variety of such materials in nature desired plasmonic response is limited to very narrow spectral band in optical frequency range due to set plasma frequencies and high absorptive losses of metals. One of the means to overcome innate limitations imposed by material properties is to combine two or more materials into metamaterial composites [3].