Physics – Optics
Scientific paper
2011-01-18
Physics
Optics
Scientific paper
Here we theoretically show, by designing and manipulating spatially inhomogeneous, non-uniform conductivity patterns across a single flake of graphene, that this single-atom-layered material can serve as a "one-atom-thick" platform for infrared metamaterials and transformation optical devices. It is known that by varying the chemical potential using gate electric and/or magnetic fields, the graphene conductivity in the THz and IR frequencies can be changed. This versatility provides the possibility that different "patches" on a single flake of graphene possess different conductivities, suggesting a mechanism to construct "single-atom-thick" IR metamaterials and transformation optical structures. Our computer simulation results pave the way for envisioning numerous IR photonic functions and metamaterial concepts-all on a "one-atom-thick" platform-of such we list a few here: edge waveguides, bent ribbon-like paths guiding light, photonic splitters and combiners, "one-atom-thick" IR scattering elements as building blocks for "flatland" metamaterials, thin strips as flatland superlenses, and "one-atom-thick" subwavelength IR lenses as tools for Fourier and transformation optics.
Engheta Nader
Vakil Ashkan
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