Terahertz emission from laser-driven gas plasmas: A plasmonic point of view

I. Thiele*, B. Zhou, A. Nguyen, E. Smetanina, R. Nuter, K. J. Kaltenecker, P. González De Alaiza Martínez, J. Déchard, L. Bergé, P.U. Jepsen, Stefan Skupin

*Corresponding author for this work

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Abstract

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. © 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.
Original languageEnglish
JournalOptica
Volume5
Issue number12
Pages (from-to)1617-1622
Number of pages6
ISSN2334-2536
DOIs
Publication statusPublished - 2018

Bibliographical note

© 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Cite this

Thiele, I., Zhou, B., Nguyen, A., Smetanina, E., Nuter, R., Kaltenecker, K. J., Martínez, P. G. D. A., Déchard, J., Bergé, L., Jepsen, P. U., & Skupin, S. (2018). Terahertz emission from laser-driven gas plasmas: A plasmonic point of view. Optica, 5(12), 1617-1622. https://doi.org/10.1364/OPTICA.5.001617