@article{Riek2017-03-01Femto-37290,
  year={2017},
  doi={10.1088/1361-6404/aa53a2},
  title={Femtosecond measurements of electric fields : from classical amplitudes to quantum fluctuations},
  number={2},
  volume={38},
  issn={0143-0807},
  journal={European Journal of Physics},
  author={Riek, Claudius and Seletskiy, Denis V. and Leitenstorfer, Alfred},
  note={Article Number: 024003}
}

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    <dc:contributor>Riek, Claudius</dc:contributor>
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    <dc:creator>Seletskiy, Denis V.</dc:creator>
    <dc:contributor>Leitenstorfer, Alfred</dc:contributor>
    <dc:contributor>Seletskiy, Denis V.</dc:contributor>
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    <dcterms:abstract xml:lang="eng">Ultrabroadband electro-optic sampling is presented as an extremely sensitive technique to detect electric field amplitudes in free space. The temporal resolution provided by few-femtosecond laser pulses results in a bandwidth exceeding 100 THz, potentially covering the entire infrared spectral range. A pedagogic introduction to the operational principle of the method is given along the lines of a classical coherent input field and a zincblende-type electro-optic sensor. We then show that even the bare vacuum fluctuations of the electric field in the quantum ground state may be detected. This time-domain approach to quantum physics operates directly on sub-cycle scales where no local energy conservation holds. Therefore, signals may be obtained from purely virtual photons without amplification to finite intensity.</dcterms:abstract>
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