Krasnok Alex, Lepeshov Sergey, Alú Andrea
Opt Express. 2018 Jun 11;26(12):15972-15994. doi: 10.1364/OE.26.015972.
Two-dimensional semiconducting transition metal dichalcogenides (TMDCs) have recently become attractive materials for several optoelectronic applications, such as photodetection, light harvesting, phototransistors, light-emitting diodes, and lasers. Their bandgap lies in the visible and near-IR range, and they possess strong excitonic resonances, high oscillator strengths, and valley-selective response. Coupling these materials to optical nanocavities enhances the quantum yield of exciton emission, enabling advanced quantum optics and nanophotonics devices. Here, we review the state-of-the-art advances of hybrid exciton-polariton structures based on monolayer TMDCs coupled to plasmonic and dielectric nanocavities. We discuss the optical properties of 2D WS, WSe, MoS and MoSe materials, paying special attention to their energy bands, photoluminescence/absorption spectra, excitonic fine structure, and to the dynamics of exciton formation and valley depolarization. We also discuss light-matter interactions in such hybrid exciton-polariton structures. Finally, we focus on weak and strong coupling regimes in monolayer TMDCs-based exciton-polariton systems, envisioning research directions and future opportunities for this material platform.
二维半导体过渡金属二硫属化物（TMDCs）最近已成为几种光电子应用的有吸引力的材料，如光电探测、光捕获、光电晶体管、发光二极管和激光器。它们的带隙位于可见光和近红外范围内，并且具有强激子共振、高振子强度和谷选择性响应。将这些材料与光学纳米腔耦合可提高激子发射的量子产率，从而实现先进的量子光学和纳米光子学器件。在这里，我们回顾了基于与等离子体和介电纳米腔耦合的单层TMDCs的混合激子-极化激元结构的最新进展。我们讨论了二维WS、WSe、MoS和MoSe材料的光学性质，特别关注它们的能带、光致发光/吸收光谱、激子精细结构以及激子形成和谷去极化的动力学。我们还讨论了这种混合激子-极化激元结构中的光-物质相互作用。最后，我们关注基于单层TMDCs的激子-极化激元系统中的弱耦合和强耦合 regime，设想该材料平台的研究方向和未来机遇。
