基于双曲型超材料纳米光子平台的二维MoS2激子动力学控制
Controlling exciton dynamics in two-dimensional MoS2 on hyperbolic metamaterial-based nanophotonic platform
摘要：
二维过渡金属二硫属化物（2D TMD）的发现为下一代光子学和光电子学应用，特别是在纳米光子学领域带来了希望。可以说，在这些应用中最关键的基本过程是二维TMD中的激子迁移和电荷转移。然而，在二维TMD中的激子动力学从未在纳米光子平台上进行过研究，更重要的是，通过纳米光子结构来控制激子动力学还有待探索。在这里，我们第一次展示了通过引入双曲超材料（HMM）基板在二硫化钼单层激子动力学的控制。我们揭示了各种激子在二硫化钼单分子膜中的迁移机制。此外，我们证明了A-激子的Förster半径可以通过引入Hlg 3通过Hlg 3的非局域效应由于Purcell效应而增加。另一方面，扩散系数是不变的C-激子上的HPLCs。这项研究为实现2D TMD纳米光子学混合器件迈出了革命性的一步。
英文摘要：
The discovery of two-dimensional transition metal dichalcogenides (2D TMDs) has promised next-generation photonics and optoelectronics applications, particularly in the realm of nanophotonics. Arguably, the most crucial fundamental processes in these applications are the exciton migration and charge transfer in 2D TMDs. However, exciton dynamics in 2D TMDs have never been studied on a nanophotonic platform and more importantly, the control of exciton dynamics by means of nanophotonic structures has yet to be explored. Here, for the first time, we demonstrate the control of exciton dynamics in MoS2 monolayers by introducing a hyperbolic metamaterial (HMM) substrate. We reveal the migration mechanisms of various excitons in MoS2 monolayers. Furthermore, we demonstrate the Förster radius of the A-excitons can be increased by introducing HMMs through the nonlocal effects of HMMs due to the Purcell effect. On the other hand, the diffusion coefficient is unchanged for the C-excitons on HMMs. This study provides a revolutionary step forward in enabling 2D TMD nanophotonics hybrid devices.
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