Terahertz emission from laser-driven gas plasmas: A plasmonic point of view
Artikel i vetenskaplig tidskrift, 2018
We disclose an unanticipated link between plasmonics and nonlinear frequency down-conversion in laser-induced gas-plasmas. For two-color femtosecond pump pulses, a plasmonic resonance is shown to broaden the terahertz emission spectra significantly. We identify the resonance as a leaky mode, which contributes to the emission spectra whenever electrons are excited along a direction where the plasma size is smaller than the plasma wavelength. As a direct consequence, such resonances can be controlled by changing the polarization properties of elliptically shaped driving laser pulses. Both experimental results and 3D Maxwell consistent simulations confirm that a significant terahertz pulse shortening and spectral broadening can be achieved by exploiting the transverse driving laser beam shape as an additional degree of freedom.
Författare
Illia Thiele
Université de Bordeaux
Chalmers, Fysik, Subatomär fysik och plasmafysik
B. Zhou
Danmarks Tekniske Universitet (DTU)
Alisée Nguyen
CEA Dam Ile-de France
E. Smetanina
Göteborgs universitet
R. Nuter
Université de Bordeaux
K. J. Kaltenecker
Danmarks Tekniske Universitet (DTU)
Pedro González De Alaiza Martínez
Université de Bordeaux
J. Dechard
CEA Dam Ile-de France
Luc Bergé
CEA Dam Ile-de France
P. U. Jepsen
Danmarks Tekniske Universitet (DTU)
Stefan Skupin
Université de Bordeaux
Université de Lyon
Optica
2334-2536 (ISSN)
Vol. 5 12 1617-1622Ämneskategorier
Atom- och molekylfysik och optik
Annan fysik
Fusion, plasma och rymdfysik
DOI
10.1364/OPTICA.5.001617