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 Bordeaux I

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 Bordeaux I

K. J. Kaltenecker

Danmarks Tekniske Universitet (DTU)

Pedro González De Alaiza Martínez

Université Bordeaux I

J. Dechard

CEA Dam Ile-de France

Luc Bergé

CEA Dam Ile-de France

P. U. Jepsen

Danmarks Tekniske Universitet (DTU)

Stefan Skupin

Université Bordeaux I

Université de Lyon

Optica

2334-2536 (ISSN)

Vol. 5 12 1617-1622

Ämneskategorier

Atom- och molekylfysik och optik

Annan fysik

Fusion, plasma och rymdfysik

DOI

10.1364/OPTICA.5.001617

Mer information

Senast uppdaterat

2019-01-02