三极管
激子
电介质
单层
材料科学
塞尔效应
光电子学
光子学
吸收(声学)
光致发光
量子阱
光发射
硅
光学
凝聚态物理
自发辐射
纳米技术
物理
激光器
复合材料
作者
Yin Liu,Sze Cheung Lau,Wen‐Hui Cheng,Amalya C. Johnson,Qitong Li,Emma M. Simmerman,Ouri Karni,Jack Hu,Fang Liu,Mark L. Brongersma,Tony F. Heinz,Jennifer A. Dionne
出处
期刊:Nano Letters
[American Chemical Society]
日期:2023-06-22
卷期号:23 (13): 6124-6131
标识
DOI:10.1021/acs.nanolett.3c01630
摘要
Excitons in two-dimensional transition metal dichalcogenides have a valley degree of freedom that can be optically manipulated for quantum information processing. Here, we integrate MoS2 monolayers with achiral silicon disk array metasurfaces to enhance and control valley-specific absorption and emission. Through the coupling to the metasurface electric and magnetic Mie modes, the intensity and lifetime of the emission of neutral excitons, trions, and defect bound excitons can be enhanced and shortened, respectively, while the spectral shape can be modified. Additionally, the degree of polarization (DOP) of exciton and trion emission from the valley can be symmetrically enhanced at 100 K. The DOP increase is attributed to both the metasurface-enhanced chiral absorption of light and the metasurface-enhanced exciton emission from the Purcell effect. Combining Si-compatible photonic design with large-scale 2D materials integration, our work makes an important step toward on-chip valleytronic applications approaching room-temperature operation.
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