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A measurement on the temporal response of a plasmonic antenna at the femtosecond time scale is reported. The antenna consists of a square array of nanometer‐size gold rods. The far‐field dispersion of light reflected from the plasmonic antenna is found to be less than that of a 1.2 mm thick glass slide. Assuming a simple oscillating dipole model this implies that the near‐field of the antenna may be used as an electron switch that responds faster than 20 fs. Alternatively, ultrafast electron diffraction may be used to investigate the near‐field dynamics of the plasmonic antenna.

Measurement of the ultrafast temporal response of a plasmonic antenna