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Optica Publishing Group
  • 2017 European Conference on Lasers and Electro-Optics and European Quantum Electronics Conference
  • (Optica Publishing Group, 2017),
  • paper EH_8_6

Ultrafast second-harmonic generations in a plasmonic two-wire transmission-line

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Abstract

Nonlinear optical frequency conversion in plasmonics has attracted immense research attention recently. Through various device geometries, harmonic generations of various orders have been reported. However, in these demonstrations, the near-field effect utilized has been limited to localized surface plasmons. It was not until last year that nonlinear frequency conversion utilizing propagating surface plasmon polaritons being reported in a single plasmonic nanowire [1]. A plasmonic two-wire transmission-line (TWTL) is comprised of two metallic nanowires with a nano-gap between these two nanowires [2,3]. Depending on the laser excitation polarization, TE or TM mode could be selectively excited within a plasmonic TWTL. It has been demonstrated the two modes could be freely converted through the geometrical design to the TWTL [3,4]. Here we experimentally demonstrate for the first time, ultrafast second-harmonic generations (SHG) in a plasmonic (TWTL). We also show that regardless of the fundamental harmonic mode excited by the laser beam, the SHG signals are always the TM mode.

© 2017 IEEE

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