@article{Woldegeorgis2018-11-20Multi-45504,
  year={2018},
  doi={10.1364/OPTICA.5.001474},
  title={Multi-MV/cm longitudinally polarized terahertz pulses from laser–thin foil interaction},
  number={11},
  volume={5},
  journal={Optica},
  pages={1474--1477},
  author={Woldegeorgis, Abel and Kurihara, Takayuki and Almassarani, Mohammed and Beleites, Burgard and Grosse, Ronny and Ronneberger, Falk and Gopal, Amrutha}
}

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    <dc:creator>Kurihara, Takayuki</dc:creator>
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    <dc:contributor>Gopal, Amrutha</dc:contributor>
    <dc:contributor>Beleites, Burgard</dc:contributor>
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    <dc:creator>Woldegeorgis, Abel</dc:creator>
    <dcterms:abstract xml:lang="eng">Longitudinally polarized terahertz radiation offers access to the elementary excitations and particles that cannot be addressed by transverse waves. While transverse electric fields exceeding 1 MV/cm are widely utilized for nonlinear terahertz spectroscopy, longitudinally polarized terahertz waves at this field strength are yet to be realized. In this paper, we experimentally demonstrate that by focusing radially polarized terahertz fields generated from laser–thin metallic foil interaction, longitudinally polarized terahertz with record-breaking field strength above 1.5 MV/cm can be obtained. Furthermore, we also traced the evolution of the geometric phase of the longitudinal component as it propagates through focus. A novel scheme based on noncollinear electro-optic detection has been utilized to unambiguously measure the polarization states. Our result will scale up the nonlinear spectroscopy of solid materials and particle acceleration experiments where on-axis polarization plays a crucial role.</dcterms:abstract>
    <dc:contributor>Ronneberger, Falk</dc:contributor>
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    <dc:creator>Beleites, Burgard</dc:creator>
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