The discoveries of numerous exciting phenomena in twisted bilayer graphene (TBG) are stimulating significant investigations on moiré structures that possess a tunable moiré potential. Optical response can provide insights into the electronic structures and transport phenomena of non-twisted and twisted moiré structures. In this article, we review both experimental and theoretical studies of optical properties such as optical conductivity, dielectric function, non-linear optical response, and plasmons in moiré structures composed of graphene, hexagonal boron nitride (hBN), and/or transition metal dichalcogenides (TMDCs). Firstly, a comprehensive introduction to the widely employed methodology on optical properties is presented. After, moiré potential induced optical conductivity and plasmons in non-twisted structures are reviewed, such as single layer graphene-hBN, bilayer graphene-hBN and graphene-metal moiré heterostructures. Next, recent investigations of twist-angle dependent optical response and plasmons are addressed in twisted moiré structures. Additionally, we discuss how optical properties and plasmons could contribute to the understanding of the many-body effects and superconductivity observed in moiré structures.
Probing Plasmonic Oscillations in 2D Moiré Nanocrystal Superlattices by Low-Loss EELS
University of Pennsylvania（宾夕法尼亚大学）；University of Washington（华盛顿大学）；SuperSTEM, SciTech Daresbury Science and Innovation Campus（超级扫描透射电子显微镜，科学技术达尔斯伯里科学与创新园区）；University of Leeds（利兹大学）
Nanyang Technological University（南洋理工大学）；Nanjing Tech University（南京工业大学）；National Institute for Materials Science（国立材料研究所）；CNRS（法国国家科学研究中心）；Université Côte d’Azûr（蔚蓝海岸大学）；Sorbonne Université（索邦大学）；National University of Singapore（新加坡国立大学）；Center for Quantum Technologies（量子技术中心）；Quantum Science and Engineering Center (QSec)（量子科学与工程中心）
University of Michigan（密歇根大学）；ITMO University（ITMO大学）；The University of Texas at Dallas（德克萨斯大学达拉斯分校）；Georgia Institute of Technology（佐治亚理工学院）；University of Iceland（冰岛大学）
Joint Quantum Institute, University of Maryland（马里兰大学联合量子研究所）；Joint Center for Quantum Information and Computer Science, University of Maryland（马里兰大学量子信息与计算机科学联合中心）；ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology（巴塞罗那科技研究所光子学研究院）
Charge Tunable Optical Nonlinearity of Moiré Exciton-Polaritons
Carl von Ossietzky Universität Oldenburg（奥尔登堡卡尔·冯·奥西埃茨基大学）；Xiamen University Malaysia（厦门大学马来西亚分校）；Friedrich-Schiller University Jena（耶拿弗里德里希·席勒大学）；Fraunhofer-Institute for Applied Optics and Precision Engineering IOF（弗劳恩霍夫应用光学和精密工程研究所IOF）；National Institute for Materials Science（国立材料研究所）；Julius-Maximilians-Universität Würzburg（维尔茨堡朱利叶斯-马克西米利安大学）；Ludwig-Maximilians-Universität München（慕尼黑路德维希-马克西米利安大学）
Hidden valley dynamics behind vanishing circular polarization in moiré excitons
National Institute for Materials Science（物质材料研究机构）；Graduate School of Chemical Sciences and Engineering, Hokkaido University（北海道大学化学理工学研究科）；University of Tsukuba（筑波大学）
Light-matter interactions in layered materials and heterostructures: from moiré physics and magneto-optical effects to ultrafast dynamics and hybrid meta-photonics
Highly nonlinear Moiré exciton and trion polaritons
Laboratory for Physical Sciences, University of Maryland（马里兰大学物理科学实验室）；University of Rochester（罗切斯特大学）；University of Notre Dame（圣母大学）；The Institute of Optics, University of Rochester（罗切斯特大学光学研究所）
