# 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…

## 20 Citations

Adiabatic Frequency Conversion Using a Time-Varying Epsilon-Near-Zero Metasurface.

- PhysicsNano letters
- 2021

It is demonstrated that this effect-known as adiabatic frequency conversion (AFC)-can be significantly enhanced by a nonlinear epsilon-near-zero-based (ENZ-based) plasmonic metasurface, and might potentially provide insights for designing efficient time-varying meetasurfaces for the manipulation of ultrafast pulses.

Broadband frequency translation through time refraction in an epsilon-near-zero material

- PhysicsNature Communications
- 2020

The authors present an experimental demonstration of adiabatic frequency conversion using the concept of time boundary by exploiting the properties of an ITO film operating near its epsilon-near-zero frequency.

Spatiotemporal refraction of light in an epsilon-near-zero ITO layer

- PhysicsOptica
- 2021

When light travels through a medium in which the refractive index is rapidly changing with time, the light will undergo a shift in its frequency. Large frequency shifting effects have recently been…

Spatiotemporal refraction of light in an epsilon-near-zero ITO layer

- Physics
- 2021

: When light travels through a medium in which the refractive index is rapidly changing with time, the light will undergo a shift in its frequency. Large frequency shifting eﬀects have recently been…

Temporal Dynamics of Strongly Coupled Epsilon Near-Zero Plasmonic Systems

- Physics2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)
- 2021

Deeply sub-wavelength epsilon near-zero (ENZ) films feature strong optical nonlinearities such as a giant Kerr effect and high four-wave mixing efficiency [1] , [2] . The enhanced nonlinear response…

Resonance-enhanced spectral funneling in Fabry–Perot resonators with a temporal boundary mirror

- PhysicsNanophotonics
- 2022

Abstract A temporal boundary refers to a specific time at which the properties of an optical medium are abruptly changed. When light interacts with the temporal boundary, its spectral content can be…

Understanding all-optical switching at the epsilon-near-zero point: a tutorial review

- PhysicsApplied Physics B
- 2022

Epsilon-near-zero (ENZ) materials that operate in the spectral region where the real part of the permittivity crosses zero have recently emerged as a promising platform for all-optical switching…

Frequency Conversion Cascade by Crossing Multiple Space and Time Interfaces.

- GeologyPhysical review letters
- 2022

Time varying media recently emerged as promising candidates to fulfill the dream of controlling the wave frequency without nonlinear effects. However, frequency conversion remains limited by the…

Fast and slow nonlinearities in ENZ materials

- Physics
- 2020

Novel materials, with enhanced light-matter interaction capabilities, play an essential role in achieving the lofty goals of nonlinear optics. Recently, Epsilon-Near-Zero (ENZ) media have emerged as…

Superscattering, Superabsorption, and Nonreciprocity in Nonlinear Antennas

- Physics
- 2020

We propose tunable nonlinear antennas based on an epsilon-near-zero material with a large optical nonlinearity. We show that the absorption and scattering cross sections of the antennas can be…

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