Modulation instability in nonlinear metamaterials induced by cubic-quintic nonlinearities and higher order dispersive effects

TL;DR

This paper investigates how cubic-quintic nonlinearities and higher order dispersive effects influence modulation instability in nonlinear metamaterials, considering loss effects and revealing increased MI gain due to nonlinearities.

Contribution

It introduces a model for pulse propagation in metamaterials with cubic-quintic nonlinearities and higher order dispersion, including loss effects, and analyzes their impact on modulation instability.

Findings

Loss distorts the MI gain spectrum sidebands.

Cubic-quintic nonlinearities increase MI gain.

Higher order dispersive effects influence MI behavior.

Abstract

We have investigated modulation instability in metamaterials (MM) with both cubic and quintic nonlinearities, based on a model appropriate for pulse propagation in MMs with cubic-quintic nonlinearities and higher order dispersive effects. We have included loss into account in our analysis and found that loss distorts the sidebands of the MI gain spectrum. We find that the combined effect of cubic-quintic nonlinearity increases the MI gain. The role of higher order nonlinear dispersive effects on MI has been also discussed.