TL;DR
This paper demonstrates that a single sheet of graphene with tailored conductivity can function as a lens and Fourier transform device for surface plasmon polaritons, enabling Fourier optics at an atomic scale.
Contribution
It introduces a novel approach to implement Fourier optics principles on graphene, a one-atom-thick material, for manipulating IR surface waves.
Findings
Graphene can focus TM surface plasmon polaritons using inhomogeneous conductivity.
Graphene can perform spatial Fourier transforms of IR SPP signals.
Potential for new optical devices based on atom-thick structures.
Abstract
Using numerical simulations, here we demonstrate that a single sheet of graphene with properly designed inhomogeneous, nonuniform conductivity distributions can act as a convex lens for focusing and collimating the transverse-magnetic (TM) surface Plasmon polariton (SPP) surface wave propagating along the graphene. Consequently, we show that the graphene can act as a platform capable of obtaining spatial Fourier transform of infra-red (IR) SPP signals. This may lead to rebirth of the field of Fourier Optics on a one-atom-thick structure.
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