Electronically Tunable Broadband THz Frequency Multipliers Based on Multilayer Nonlinear Graphene Metasurfaces

A. Lerer, G. Makeeva, V. V. Cherepanov
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引用次数: 2

Abstract

A numerical method for modeling of nonlinear effects in the multilayer metasurfaces of rectangular graphene nanoribbons was developed based on the solution of nonlinear diffraction problem for Maxwell's equations, complemented by the model of the nonlinear graphene surface conductivity. The numerical analysis taking into account the third order conductivity of graphene in the presence of high intensity THz field shows an efficient frequency multiplication mechanism in the condition of resonance of the surface plasmon-polariton waves and standing waves due to reflection from dielectric separation layers and graphene ribbon arrays. The normalized power of third-harmonic wave, emitted in the forward (transmission) and the backward (reflection) directions by multilayer graphene nanoribbons metasurfaces as a function of frequency of the incident waves of s- and p-polarization were calculated. It is shown, how the efficiency of third harmonic generation at the resonant frequency depends on the structural parameters of THz frequency multipliers such as the periodicity of arrays, geometrical sizes of graphene nanoribbons, the thickness of dielectric layers and the change in its dielectric permeability, the variation in the graphene chemical potential.
基于多层非线性石墨烯超表面的电子可调谐宽带太赫兹倍频器
在求解麦克斯韦方程组非线性衍射问题的基础上,建立了矩形石墨烯纳米带多层超表面非线性效应的数值模拟方法,并与石墨烯表面非线性电导率模型相结合。考虑高强度太赫兹场存在下石墨烯三阶电导率的数值分析表明,在介电分离层和石墨烯带状阵列反射引起的表面等离子体极化子波和驻波共振条件下,石墨烯具有有效的倍频机制。计算了多层石墨烯纳米带超表面在正向(透射)和反向(反射)方向发射的三次谐波归一化功率与s极化和p极化入射波频率的关系。结果表明,谐振频率下的三次谐波产生效率取决于太赫兹倍频器的结构参数,如阵列的周期性、石墨烯纳米带的几何尺寸、介电层的厚度及其介电渗透率的变化、石墨烯化学势的变化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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