Research Papers in Physics and Astronomy


Date of this Version



Annalen der Physik (2012) 5: 201200206.


Post print. Copyright 2012, Springer. Used by permission.


We report a measurement on the temporal response of a plasmonic antenna at the femtosecond time scale. The antenna consists of a square array of nanometer-size gold rods. We find that the far-field dispersion of light reflected from the plasmonic antenna is 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 f s. Alternatively, ultrafast electron diffraction may be used to investigate the near-field dynamics of the plasmonic antenna.

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