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在ReSe₂/ReS₂异构结构中的超快电荷转移诱导的异常非线性光学响应

Yanqing Ge¹, Jiayu Tan¹, Guorong Xu¹

¹Shaanxi Joint Laboratory of Graphene, State Key Laboratory of Photon-Technology in Western China Energy, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon-Technology, School of Physics, Northwest University, Xi'an 710069, China.

|October 22, 2024

概括

在ReSe2/ReS2异构中超快速的电荷转移使可调节的非线性吸收成为可能. 这一发现为新的光子和光电子设备推进了二维材料.

科学领域:

材料科学材料科学材料科学
凝聚物质物理学凝聚物质物理学
光电学是指光电子产品.

背景情况:

范德瓦尔斯的异构结构为先进的设备提供可调节的光学和电气特性.
类型II异构结构中的非线性吸收动力学对于全光学逻辑门至关重要,但仍未得到充分探索.

研究的目的:

为了研究二维ReSe2/ReS2异构结构中的非线性吸收转换动态.
探索控制从反向和吸收到和吸收 (SA) 的过渡的潜在物理机制.

主要方法:

一个二维的ReSe2/ReS2异构结构的制造和表征.
五秒短暂吸收光谱检测非线性光学特性.
X射线光电子光谱,紫外线光电子光谱,凯尔文探针力显微镜和密度函数理论计算用于机械洞察.

主要成果:

观察到从反向和吸收到和吸收 (SA) 的异常过渡,的强度值为~170GW/cm2.
将这种转变归因于ReS2二光子吸收 (TPA) 的下降和ReSe2SA的增加,随着强度的增加.
提出了一种II型电荷转移能量水平模型,解释了观察到的非线性吸收行为.

结论:

超快的界面电荷转移在调整非线性吸收和增强ReSe2/ReS2异构结构中的SA方面发挥着至关重要的作用.
这些发现加深了对2D异构结构中非线性吸收机制的理解.
这项工作扩大了非线性光学材料和光子设备的范围.

关键词:

反向可和吸收的吸收.可以和的吸收.类型II ReSe2/ReS2异构结构的异构结构.超快速的电荷转移是超快的不寻常的非线性吸收转换.

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