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The schematic diagram of a dielectric/dielectric/graphene/dielectric structure with permittivities .
The schematic of a plasmonic Luneburg lens, in which a dielectric cone is placed on a monolayer graphene, where D = 340 nm and L = 500 nm.
The mode index required by the Luneburg lens at 30 THz with .
The effective mode index of SPP at 30 THz versus the thickness of the second dielectric layer in the dielectric/dielectric/graphene/dielectric structure. In the simulation, we set , , , and nm.
Simulation results of the plasmonic Luneburg lens, showing the z component of electric field of SPP wave at 30 THz. (a) The spherical SPP wave is evolved into a plane SPP wave. (b) The plane SPP wave focuses into a point after propagating the lens.
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