Broad Frequency Shift of Parametric Processes in Epsilon-Near-Zero Time-Varying Media
Abstract
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Feb 15, 2020
- Source ID
- 10.3390/app10041318
Entities
People
- Alexandra Boltasseva
- Clayton Devault
- Daniele Faccio
- Enrico Carnemolla
- Marcello Ferrera
- Matteo Clerici
- Stefano Vezzoli
- Vincenzo Bruno
- Vladimir M. Shalaev
Organizations
- Air Force Office of Scientific Research
- Engineering and Physical Sciences Research Council
- Office of Naval Research
- Savannah River Operations Office
- UK Research and Innovation