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The normal-incidence absorption spectra of the graphene monolayer, for the Au nanosphere to be replaced by the Ag nanosphere, the Au nanodisk, and the Ag nanodisk, respectively. The array periods are px = 400 nm and py = 700 nm. The nanospheres have a diameter of 150 nm. The nanodisks have a diameter of 120 nm and a thickness of 60 nm.
