Abstract
In this paper we present the efficient design of functional thin-film metamaterial devices with the effective surface conductivity approach. As an example, we demonstrate a graphene based perfect absorber. After formulating the requirements to the perfect absorber in terms of surface conductivity we investigate the properties of graphene wire medium and graphene fishnet metamaterials and demonstrate both narrowband and broadband tunable absorbers.
Highlights
Terahertz (THz) radiation provides many useful applications for spectroscopy, biomedical imaging, security, food quality control and communication [1,2,3]
A material consisting of one monolayer of carbon atoms, provides unique properties, such as optical transparency, flexibility, high electron mobility and conductivity, which can be tuned by electrochemical potential via, for example, electrostatic gating, magnetic field or optical excitation [4,5,6]
Continuous and structured graphene allows for an ultimate terahertz radiation control resulting in functional devices [16], such as modulators [17,18,19], hyperlenses [20], tunable reflectors, filters, absorbers and polarizers [21,22,23,24]
Summary
Terahertz (THz) radiation provides many useful applications for spectroscopy, biomedical imaging, security, food quality control and communication [1,2,3]. It was theoretically shown that graphene supports surface plasmon polaritons in the terahertz and infrared ranges [7,8,9,10,11,12,13,14,15] and can be a building material for metamaterials, which provide a wider range of electromagnetic properties than continuous graphene. In most cases modeling of graphene metamaterial based devices is based on numerical simulation and optimization and requires multiple variables analysis. It makes the design process slower and more complicated, and hinders important physics. In this paper we propose a simple, yet powerful method for graphene metamaterials description and tunable perfect absorber design.
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