Adiabatic description of superfocusing of femtosecond plasmon polaritons

P. A. Golovinski, E. S. Manuylovich*, V. A. Astapenko

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

A surface plasmon polariton is a collective oscillation of free electrons at a metal–dielectric interface. As wave phenomena, surface plasmon polaritons can be focused with the use of an appropriate excitation geometry of metal structures. In the adiabatic approximation, we demonstrate a possibility to control nanoscale short pulse superfocusing based on generation of a radially polarized surface plasmon polariton mode of a conical metal needle in view of wave reflection. The results of numerical simulations of femtosecond pulse propagation along a nanoneedle are discussed. The space–time evolution of a pulse for the near field strongly depends on a linear chirp of an initial laser pulse, which can partially compensate wave dispersion. The field distribution is calculated for different metals, chirp parameters, cone opening angles and propagation distances. The electric field near a sharp tip is described as a field of a fictitious time-dependent electric dipole located at the tip apex.

Original languageEnglish
Pages (from-to)920-927
Number of pages8
JournalJournal of Modern Optics
Volume65
Issue number8
DOIs
Publication statusPublished - 4 May 2018

Keywords

  • femtosecond pulse
  • pulse compression
  • subwavelength structures
  • surface plasmons
  • Waveguides

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