arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2212.09147physics.opticscond-mat.mes-hallcond-mat.mtrl-sci
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用于单层MoS2谷特定发光光谱与偏振控制的手性介电超表面

Achiral dielectric metasurfaces for spectral and polarization control of valley specific light emission from monolayer MoS2

Yin Liu, Sze Cheung Lau, Wen-Hui Sophia Cheng, Amalya Johnson, Qitong Li, Emma Simmerman, Ouri Karni, Jack Hu, Fang Liu, Mark L. Brongersma, Tony F. Heinz, Jennifer A. Dionne

AI总结:

本研究将单层MoS2与非手性硅盘阵列超表面集成,通过耦合Mie模式增强并控制了谷特定吸收与发射,实现了激子和trions偏振度的对称提升,为片上谷电子学应用迈出重要一步。

摘要:

二维过渡金属硫族化物中的激子具有谷自由度,可通过光学手段访问和操控以用于量子信息处理。在此,我们将MoS2与非手性硅盘阵列超表面集成,以增强和控制谷特定的吸收和发射。通过与超表面Mie模式的耦合,中性激子、trions和缺陷束缚激子的发射强度和寿命可被增强,同时光谱形状可被修改。此外,我们通过谷分辨PL测量证明了对中性激子和trions偏振度(DOP)的对称增强,并发现在100K下,激子发射的DOP可高达24%,trion发射的DOP可高达34%。通过分析超表面谐振器对手性吸收的近场影响以及Purcell效应增强的发射,可以理解这些结果。将兼容Si的光子设计与大规模(毫米级)2D材料集成相结合,我们的工作向接近室温操作的片上谷电子学应用迈出了重要一步。

英文摘要:

Excitons in two-dimensional transition metal dichalcogenides have a valley degree of freedom that can be optically accessed and manipulated for quantum information processing. Here, we integrate MoS2 with achiral silicon disk array metasurfaces to enhance and control valley-specific absorption and emission. Through the coupling to the metasurface Mie modes, the intensity and lifetime of the emission of neutral excitons, trions and defect bound excitons can be enhanced, while the spectral shape can be modified. Additionally, we demonstrate the symmetric enhancement of the degree-of-polarization (DOP) of neutral exciton and trions via valley-resolved PL measurements, and find that the DOP can be as high as 24% for exciton emission and 34% for trion emission at 100K. These results can be understood by analyzing the near-field impact of metasurface resonators on both the chiral absorption of MoS2 emitters as well as the enhanced emission from the Purcell effect. Combining Si-compatible photonic design with large-scale (mm-scale) 2D materials integration, our work makes an important step towards on-chip valleytronic applications approaching room-temperature operation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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