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Graphene can be biased by electrical gating or by chemical doping, which modifies its Fermi level and enables the existence of surface plasmons propagating along graphene. These surface plasmons, because of the two-dimensional (2D) nature of this material, have very short wavelengths and extreme out-of-plane confinement. Graphene plasmons feature in the THz regime with relatively low losses, where...
Here we demonstrate the emergence of localized surface plasmon modes of geometrical origin in metallic particles whose surface is periodically textured at a subwavelength scale. In particular, we study a novel magnetic mode appearing in such structures, which features subwavelength confinement and has no analogue in conventional particle plasmonics.
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