Mechanisms of THz generation from silver nanoparticle and nanohole arrays

D.K. Polyushkin, I. Marton, P. Racz, P. Dombi, E. Hendry, William Leslie Barnes

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28 Citations (Scopus)

Abstract

We study THz pulses generated from plasmonic metal nanostructures under femtosecond illumination of near-IR light. We find two regimes of excitation, according to the order of the dependence of the THz fluence on the incident near-IR intensity: less then second order at low intensities, changing to approximately fourth order for higher intensities. These regimes are most likely associated with two THz generation mechanisms: optical rectification, and the ponderomotive acceleration of ejected electrons. These data provide evidence that both mechanisms can be at work in the same experiment.
Original languageEnglish
Article number125426
Pages (from-to)-
JournalPhysical review B: Condensed matter and materials physics
Volume89
Issue number12
DOIs
Publication statusPublished - 2014

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Keywords

  • IR-94412
  • METIS-309325

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