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Fig. 1 | Nanoscale Research Letters

Fig. 1

From: Multiband and Broadband Absorption Enhancement of Monolayer Graphene at Optical Frequencies from Multiple Magnetic Dipole Resonances in Metamaterials

Fig. 1

Schematic of metamaterials for multiband and broadband absorption enhancement of graphene at optical frequencies, which are composed of a graphene monolayer sandwiched between four Ag nanodisks and a SiO2 spacer on an Ag substrate. Geometrical parameters p x and p y are the array periods along the x and y directions, respectively; t is the thickness of the SiO2 spacer; d 1 , d 2 , d 3 , and d 4 are the diameters of four Ag nanodisks (d 1  > d 2  > d 3  > d 4 ); h is the height of the Ag nanodisks. Ein, Hin, and Kin are the electric field, magnetic field, and wave vector of the incident light, which are along the x, y, and z axes, respectively

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