Enhanced third-harmonic generation induced by nonlinear field resonances in plasmonic-graphene metasurfaces

Abstract

Nonlinear metasurfaces offer new paradigm for boosting optical effect beyond limitations of conventional materials. In this work, we present an alternative way to produce pronounced third-harmonic generation (THG) based on nonlinear field resonances rather than linear field enhancement, which is a typical strategy for achieving strong nonlinear response. By designing and studying a nonlinear plasmonic-graphene metasurface at terahertz regime with hybrid guided modes and bound states in the continuum modes, it is found that a THG with a narrow bandwidth can be observed, thanks to the strong resonance between generated weak THG field and these modes. Such strong nonlinear field resonance greatly enhances the photon-photon interactions, thus resulting in a large effective nonlinear coefficient of the whole system. This finding provides new opportunity for studying nonlinear optical metasurfaces.

Accepted by Optics Express

References in corpus (8)

• Nonlinear metasurfaces governed by bound states in the continuum
• Meta-Gratings: Beyond the Limits of Graded Metasurfaces for Wavefront Control
• Enhanced High-Harmonic Generation from an All-Dielectric Metasurface
• Perfect Anomalous Reflection with a Binary Huygens' Metasurface
• Third order nonlinearity of graphene: effects of phenomenological relaxation and finite temperature
• Anapoles in Free-Standing III-V Nanodisks Enhancing Second-Harmonic Generation
• Hybrid Graphene-Plasmonic Gratings to Achieve Enhanced Nonlinear Effects at Terahertz Frequencies
• Nonlinearity in the Dark: Broadband Terahertz Generation with Extremely High Efficiency

Cited by in corpus (1)

• Multiplexing-oriented plasmon-MoS2 hybrid metasurfaces driven by nonlinear quasi bound states in the continuum