论文标题
双曲线元结构中最佳场增强模式引起的2D材料的巨型非线性响应
Giant nonlinear response of 2D materials induced by optimal field-enhancement gain mode in hyperbolic meta-structure
论文作者
论文摘要
超材料中的谐振模式已被广泛用于放大2D材料的光学响应用于实用设备应用。但是，谐振模式下的高损失严重阻碍了超材料的应用。在这里，我们引入了一个现场增益增益（FEG）因素，以找到FEG模式，以显着改善光 - 肌电相互作用。作为演示，我们通过实验比较了双曲线元结构中最佳FEG和谐振模式引起的单层MOS2的第二次谐波产生增强。使用最佳FEG模式，我们获得了22145倍的增强，转化效率为1.1*10-6 W-1，它们分别比以前报道的单层MOS2高一个和两个数量级。在〜80 nm上的宽带高效率区域，其中非线性增强大于谐振模式所引起的宽带高区域。 FEG因素的概念是超材料的一般性，为推进其应用开辟了新的方式。
Resonant modes in metamaterials have been widely utilized to amplify the optical response of 2D materials for practical device applications. However, the high loss at the resonant mode severely hinders metamaterial applications. Here, we introduce a field-enhancement gain (FEG) factor to find the FEG mode for significantly improving light-matter interaction. As a demonstration, we experimentally compared the second harmonic generation enhancement of monolayer MoS2 induced by the optimal FEG and resonant modes in hyperbolic meta-structures. With the optimal FEG mode, we obtained an enhancement of 22145-fold and a conversion efficiency of 1.1*10-6 W-1, which are respectively one and two orders of magnitude higher than that previously reported of monolayer MoS2. A broadband high-FEG region over ~80 nm where the nonlinear enhancement is larger than that induced by the resonant mode is achieved. The concept of FEG factor is general to metamaterials, opening a new way for advancing their applications.
