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The ultrafast changes of material properties induced by short laser pulsescan lead to frequency shift of reflected and transmitted radiation. Recentreports highlight how such a frequency shift is enhanced in the spectralregions where the material features a near-zero real part of the permittivity.Here we investigate the frequency shift for fields generated by four-wavemixing with a nonlinear polarisation oscillating at twice the pump frequency.In our experiment we observe a frequency shift of more than 60 nm (compared tothe pulse width of ~40 nm) for the phase conjugated radiation generated by a500 nm Aluminium-doped Zinc Oxide (AZO) film pumped close to theepsilon-near-zero wavelength. Our results indicate applications of time-varyingmedia for nonlinear optics and frequency conversion.

Broad frequency shift of parametric processes in Epsilon-Near-Zero time-varying media