Xiao Zhenyang, Xu Fang, Zhong Xuying, Yuan Jiaren, Liao Xiaxia, Zhou Weichang, Zhou Yangbo
Department of Materials Science, School of Physics and Materials Science, Nanchang University, Jiangxi, People's Republic of China.
Jiangxi Provincial Key Laboratory of Photodetectors, Nanchang University, Nanchang, Jiangxi, People's Republic of China.
Nanoscale. 2025 Jun 19;17(24):14932-14940. doi: 10.1039/d5nr00744e.
Two-dimensional (2D) van der Waals (vdW) materials with low crystal symmetry exhibit unique anisotropic optical and electronic properties. Here, we systematically investigate the optical modulation effects induced by anisotropic 2D materials on their isotropic counterparts in vertically stacked heterostructures. Through angle-resolved polarized Raman and photoluminescence (PL) spectroscopy of MoS/NbPS heterostructures, we observe periodic modulation of Raman and PL intensities in the intrinsically isotropic monolayer MoS, directly correlated with the crystallographic orientation of the anisotropic NbPS substrate. This phenomenon arises from strong in-plane birefringence and dichroism in NbPS, which create a polarization-dependent Fabry-Pérot cavity that dynamically tailors the optical environment of MoS cavity-mediated interference. Furthermore, we demonstrate magnetic field control of this anisotropic response through magneto-optic coupling, while polarization-resolved photocurrent measurements reveal the effect of in-plane anisotropy in NbPS on carrier transport in MoS. Our work establishes a cavity-mediated methodology to engineer light-matter interactions in isotropic 2D materials through anisotropic heterostructure design, opening avenues for developing advanced polarization-sensitive optoelectronics such as angle-resolved photodetectors and reconfigurable optical modulators.
具有低晶体对称性的二维（2D）范德华（vdW）材料展现出独特的各向异性光学和电子特性。在此，我们系统地研究了垂直堆叠异质结构中各向异性二维材料对其各向同性对应物所诱导的光学调制效应。通过对MoS/NbPS异质结构进行角分辨偏振拉曼光谱和光致发光（PL）光谱分析，我们在本征各向同性的单层MoS中观察到拉曼强度和PL强度的周期性调制，这与各向异性NbPS衬底的晶体学取向直接相关。这种现象源于NbPS中强烈的面内双折射和二向色性，它们形成了一个依赖于偏振的法布里 - 珀罗腔，该腔动态地调整了MoS腔介导干涉的光学环境。此外，我们通过磁光耦合展示了对这种各向异性响应的磁场控制，而偏振分辨光电流测量揭示了NbPS中的面内各向异性对MoS中载流子输运的影响。我们的工作建立了一种腔介导方法，通过各向异性异质结构设计来调控各向同性二维材料中的光与物质相互作用，为开发先进的偏振敏感光电器件（如角分辨光电探测器和可重构光学调制器）开辟了道路。
