Nonlinear Dispersion Relation and Out‐of‐Plane Second Harmonic Generation in MoSSe and WSSe Janus Monolayers
Nonlinear Dispersion Relation and Out‐of‐Plane Second Harmonic Generation in MoSSe and WSSe Janus Monolayers
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DOI：
10.1002/adom.202300958
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发表时间：
2023-03
影响因子：
9
通讯作者：
Marko M. Petrić;Viviana Villafañe;P. Herrmann;Amine Ben Mhenni;Ying Qin;Yasir Sayyad;Yuxia Shen-
中科院分区：
文献类型：
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作者：
Marko M. Petrić;Viviana Villafañe;P. Herrmann;Amine Ben Mhenni;Ying Qin;Yasir Sayyad;Yuxia Shen-
Janus过渡金属二硫化物是一类新兴的原子薄材料，具有工程破镜对称性，可产生长寿命的偶极激子、拉什巴分裂和拓扑保护的孤子。由于其宽带谐波产生可调谐性、易于在光子结构上集成以及超出基础晶面的非线性，它们作为多功能非线性光学平台具有广阔的前景。这里，研究了 MoSSe 和 WSSe Janus 单层中的二次和三次谐波的产生。偏振分辨光谱用于绘制 MoSSe 的完整二阶磁化率张量，包括其面外分量。此外，在室温和低温下测量了 MoSSe 和 WSSe 的有效三阶磁化率和接近激子共振的二阶非线性色散。这项工作为理解 Janus 过渡金属二硫属化物的非线性光学特性并探讨其在下一代片上多面光子器件中的应用奠定了基础。
Janus transition metal dichalcogenides are an emerging class of atomically thin materials with engineered broken mirror symmetry that gives rise to long‐lived dipolar excitons, Rashba splitting, and topologically protected solitons. They hold great promise as a versatile nonlinear optical platform due to their broadband harmonic generation tunability, ease of integration on photonic structures, and nonlinearities beyond the basal crystal plane. Here, second and third harmonic generation in MoSSe and WSSe Janus monolayers is studied. Polarization‐resolved spectroscopy is used to map the full second‐order susceptibility tensor of MoSSe, including its out‐of‐plane components. In addition, the effective third‐order susceptibility and the second‐order nonlinear dispersion close to exciton resonances for both MoSSe and WSSe are measured at room and cryogenic temperatures. This work sets a bedrock for understanding the nonlinear optical properties of Janus transition metal dichalcogenides and probing their use in the next‐generation on‐chip multifaceted photonic devices.