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A sub-100-fs plasmonic switch. (A) The dynamics of the hotspots are resolved in a pump-probe experiment. (B) Between a pump-probe delay of −50 fs and 35 fs the luminescence intensity switches from the 530-nm antenna bar to the 620-nm antenna bar with a contrast ratio ∼2.8 (Right). Imaging the antenna with these delays fixed demonstrates the sub-100-fs plasmonic switching (Left).
