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Narrowband and ultra-wideband modulation instability in nonlinear metamaterial waveguides
Linale, N. Fierens, Pablo Ignacio Hernández, Santiago M. Bonetti, Juan I. Grosz, Diego
Linale, N.
Fierens, Pablo Ignacio
Hernández, Santiago M.
Bonetti, Juan I.
Grosz, Diego
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Artículo de publicación periódica
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Abstract
"Waveguides based on metamaterials may exhibit strongly frequency-dependent nonlinearities. In this work, we focus on the phenomenon of modulation instability in this type of waveguide, departing from a new modeling equation that ensures strict conservation of both the energy and photon number of the parametric process. In particular, we analyse the case of a waveguide with a linearly frequency-dependent nonlinear coefficient, revealing unique features such as narrowband and ultra-wideband gain spectra and the suppression of the power cutoff giving rise to an ever-growing MI gain. These markedly distinct regimes are enabled by self-steepening (SS) and manifest themselves depending upon the magnitude and sign of the SS parameter.We believe these findings to be most relevant in the context of mid-IR supercontinuum sources."
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2020-11-01
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METAMATERIALES, MODULACION, GUIAS DE ONDAS, BANDA ULTRAANCHA