二维过渡金属二硫属化合物中光-物质相互作用的增强
Enhanced Light-Matter Interaction in Two-Dimensional Transition Metal Dichalcogenides
摘要：
二维（2D）过渡金属二硫属化物（TMDC）材料，例如MoS2、WS2、MoSe2和WSe2，由于其非凡的物理性质，在过去十年中受到广泛关注。这些独特的性质使其成为各种电子、光子和光电子器件的理想材料。然而，由于它们原子级薄的形状因子，它们的性能受到相对较弱的光-物质相互作用的限制。共振纳米光子结构提供了一种可行的方法来解决这个问题，并增强2D TMDC中的光-物质相互作用。在这里，我们提供了这个研究领域的概述，展示相关的应用，包括奇异的光发射，吸收和散射功能。首先介绍了1L-TMDC中激子的概念和腔增强发光的基本理论，然后讨论了腔增强发光、强耦合和谷电子学的最新进展。1L-TMDC的原子薄性质使得能够通过多种方式来调节其电学和光学性质。因此，我们继续通过审查的进展，TMDC为基础的可调光子器件。接下来，我们调查的最新进展，增强光吸收在窄和宽的带宽使用1L或少层TMDC，和它们的应用程序的光电转换器和光电探测器。我们还回顾了工程光散射的最新努力，例如，诱导Fano共振，通过集成共振结构（例如等离子体/Mie共振超颖表面）或直接图案化单层/少层TMDC在1L或少层TMDC中进行波前工程。然后，我们概述了不同类型的范德华异质结构的有趣的物理特性，以及它们在光电和光子器件中的应用。最后，我们得出我们的意见，在这个快速发展的研究领域的潜在机遇和挑战。
英文摘要：
Two dimensional (2D) transition metal dichalcogenide (TMDC) materials, such as MoS2, WS2, MoSe2, and WSe2, have received extensive attention in the past decade due to their extraordinary physical properties. The unique properties make them become ideal materials for various electronic, photonic and optoelectronic devices. However, their performance is limited by the relatively weak light-matter interactions due to their atomically thin form factor. Resonant nanophotonic structures provide a viable way to address this issue and enhance light-matter interactions in 2D TMDCs. Here, we provide an overview of this research area, showcasing relevant applications, including exotic light emission, absorption and scattering features. We start by overviewing the concept of excitons in 1L-TMDC and the fundamental theory of cavity-enhanced emission, followed by a discussion on the recent progress of enhanced light emission, strong coupling and valleytronics. The atomically thin nature of 1L-TMDC enables a broad range of ways to tune its electric and optical properties. Thus, we continue by reviewing advances in TMDC-based tunable photonic devices. Next, we survey the recent progress in enhanced light absorption over narrow and broad bandwidths using 1L or few-layer TMDCs, and their applications for photovoltaics and photodetectors. We also review recent efforts of engineering light scattering, e.g., inducing Fano resonances, wavefront engineering in 1L or few-layer TMDCs by either integrating resonant structures, such as plasmonic/Mie resonant metasurfaces, or directly patterning monolayer/few layers TMDCs. We then overview the intriguing physical properties of different types of van der Waals heterostructures, and their applications in optoelectronic and photonic devices. Finally, we draw our opinion on potential opportunities and challenges in this rapidly developing field of research.
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