Bruno, V., Vezzoli, S., DeVault, C., Carnemolla, E., Ferrera, M., Boltasseva, A., Shalaev, V. M., Faccio, D. and Clerici, M. (2020) Broad frequency shift of parametric processes in epsilon-near-zero time-varying media. Applied Sciences, 10(4), 1318. (doi: 10.3390/app10041318)
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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.
Item Type: | Articles |
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Additional Information: | This article belongs to the Special Issue Ultrafast Nonlinear Properties of Near-Zero Index Media and Metamaterials Out of Equilibrium. |
Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Bruno, Mr Vincenzo and Clerici, Professor Matteo and Vezzoli, Dr Stefano and Faccio, Professor Daniele |
Authors: | Bruno, V., Vezzoli, S., DeVault, C., Carnemolla, E., Ferrera, M., Boltasseva, A., Shalaev, V. M., Faccio, D., and Clerici, M. |
College/School: | College of Science and Engineering > School of Physics and Astronomy |
Journal Name: | Applied Sciences |
Publisher: | MDPI |
ISSN: | 2076-3417 |
ISSN (Online): | 2076-3417 |
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