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

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
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 Faccio, Professor Daniele and Clerici, Dr Matteo and Vezzoli, Dr Stefano
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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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
302459Infrared time-domain quantum opticsMatteo ClericiEngineering and Physical Sciences Research Council (EPSRC)EP/S001573/1ENG - Electronics & Nanoscale Engineering