Broad frequency shift of parametric processes in epsilon-near-zero time-varying media

Vincenzo Bruno, Stefano Vezzoli, Clayton De Vault, Enrico Carnemolla, Marcello Ferrera, Alexandra Boltasseva, Vladimir M. Shalaev, Daniele Faccio, Matteo Clerici*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)
37 Downloads (Pure)


The ultrafast changes of material properties induced by short laser pulses can lead to a frequency shift of reflected and transmitted radiation. Recent reports highlight how such a frequency shift is enhanced in 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. In our experiment, we observed a frequency shift of more than 60 nm (compared to the pulse width of 40 nm) in the phase conjugated radiation generated by a 500 nm aluminium-doped zinc oxide (AZO) film pumped close to the epsilon-near-zero wavelength. Our results indicate applications of time-varying media for nonlinear optics and frequency conversion.

Original languageEnglish
Article number1318
JournalApplied Sciences
Issue number4
Publication statusPublished - 15 Feb 2020


  • Epsilon-near-zero media
  • Four-wave mixing
  • Frequency shift
  • Optical kerr nonlinearities
  • Time-varying media
  • Transparent conductive oxides

ASJC Scopus subject areas

  • General Materials Science
  • Instrumentation
  • General Engineering
  • Process Chemistry and Technology
  • Computer Science Applications
  • Fluid Flow and Transfer Processes


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