Exciton–Plasmon Coupling in 2D Semiconductors Accessed by Surface Acoustic Waves,ACS Photonics

当前位置： X-MOL 学术 › ACS Photonics › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Exciton–Plasmon Coupling in 2D Semiconductors Accessed by Surface Acoustic Waves
ACS Photonics ( IF 6.5 ) Pub Date : 2021-05-31 , DOI: 10.1021/acsphotonics.1c00173
Rajveer Fandan _{1,

2} , Jorge Pedrós _{1,

2} , Fernando Calle _{1,

2}

Affiliation

We theoretically demonstrate the strong coupling between excitons in 2D semiconductors and surface plasmons in a thin metal film forming exciton–plasmon polaritons (or plexcitons) that can be optically accessed by means of a surface acoustic wave (SAW). The strain field of the SAW creates a dynamic diffraction grating, providing the momentum match for the surface plasmons, whereas the piezoelectric field that could dissociate the excitons is canceled out by the metal. This is exemplified for monolayer MoS₂ and mono- and few-layer black phosphorus on top of a thin silver layer on a LiNbO₃ piezoelectric substrate, providing Rabi splittings of 100–150 meV. Thus, we demonstrate that SAWs are powerful tools to modulate the optical properties of supported 2D semiconductors by means of the high-frequency localized deformations tailored by the acoustic transducers, that can serve as electrically switchable launchers of propagating plexcitons suitable for active high-speed nanophotonic applications.

中文翻译：

通过声表面波访问的二维半导体中的激子-等离子体耦合

我们从理论上证明了 2D 半导体中的激子与薄金属膜中的表面等离子体之间的强耦合，形成激子 - 等离子体激元（或丛激子），可以通过表面声波（SAW）进行光学访问。SAW 的应变场产生动态衍射光栅，为表面等离子体提供动量匹配，而可以解离激子的压电场被金属抵消。这以在 LiNbO ₃上的薄银层顶部的单层 MoS ₂和单层和少层黑磷为例压电基板，提供 100-150 meV 的 Rabi 分裂。因此，我们证明了 SAW 是通过声换能器定制的高频局部变形来调节支持的 2D 半导体的光学特性的强大工具，它可以作为适用于有源高速纳米光子的传播 plexcitons 的电开关发射器。应用程序。

更新日期：2021-06-17

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11