Broad Frequency Shift of Parametric Processes in Epsilon-Near-Zero Time-Varying Media

@article{Bruno2019BroadFS,
  title={Broad Frequency Shift of Parametric Processes in Epsilon-Near-Zero Time-Varying Media},
  author={Vincenzo Bruno and Stefano Vezzoli and Clayton DeVault and Enrico Giuseppe Carnemolla and M Ferrera and Alexandra Boltasseva and Vladimir M. Shalaev and Daniele Faccio and Matteo Clerici},
  journal={arXiv: Optics},
  year={2019}
}
The ultrafast changes of material properties induced by short laser pulses can lead to frequency shift of reflected and transmitted radiation. Recent reports highlight how such a frequency shift is enhanced in the spectral regions where the material features a near-zero real part of the permittivity. Here we investigate the frequency shift for fields generated by four-wave mixing with a nonlinear polarisation oscillating at twice the pump frequency. In our experiment we observe a frequency… 

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