论文标题
在等离子 - 透明烯元面的非线性场共振引起的增强的第三次谐波产生
Enhanced third-harmonic generation induced by nonlinear field resonances in plasmonic-graphene metasurfaces
论文作者
论文摘要
非线性元信息提供了新的范式，可超越传统材料的限制，从而提高光学效果。在这项工作中，我们提出了一种基于非线性场共振而不是线性场增强的明显方法来产生明显的第三次谐波生成（THG），这是实现强非线性反应的典型策略。通过在Terahertz制度上设计和研究具有混合指导模式和连续模式中的绑定状态的非线性等离子体 - 透明度元面，可以观察到具有狭窄带宽的THG，这要归功于产生的弱THG场和这些模式之间的强烈共振。如此强大的非线性场共振极大地增强了光子 - 光子相互作用，从而导致整个系统的有效非线性系数。这一发现为研究非线性光学跨面提供了新的机会。
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.
