各向异性
各向同性
材料科学
对称(几何)
单层
凝聚态物理
光学各向异性
纳米材料
光学
纳米技术
物理
几何学
数学
作者
Wei‐Zheng Shen,Chunguang Hu,Tao Jin,Jun Liu,Shuangqing Fan,Yaxu Wei,Chunhua An,Jiancui Chen,Sen Wu,Yanning Li,Jing Liu,Daihua Zhang,Lidong Sun,Chunguang Hu
出处
期刊:Nanoscale
[The Royal Society of Chemistry]
日期:2018-01-01
卷期号:10 (17): 8329-8337
被引量:56
摘要
Optical anisotropy is one of the most fundamental physical characteristics of emerging low-symmetry two-dimensional (2D) materials. It provides abundant structural information and is crucial for creating diverse nanoscale devices. Here, we have proposed an azimuth-resolved microscopic approach to directly resolve the normalized optical difference along two orthogonal directions at normal incidence. The differential principle ensures that the approach is only sensitive to anisotropic samples and immune to isotropic materials. We studied the optical anisotropy of bare and encapsulated black phosphorus (BP) and unveiled the interference effect on optical anisotropy, which is critical for practical applications in optical and optoelectronic devices. A multi-phase model based on the scattering matrix method was developed to account for the interference effect and then the crystallographic directions were unambiguously determined. Our result also suggests that the optical anisotropy is a probe to measure the thickness with monolayer resolution. Furthermore, the optical anisotropy of rhenium disulfide (ReS2), another class of anisotropic 2D materials, with a 1T distorted crystal structure, was investigated, which demonstrates that our approach is suitable for other anisotropic 2D materials. This technique is ideal for optical anisotropy characterization and will inspire future efforts in BP and related anisotropic 2D nanomaterials for engineering new conceptual nanodevices.
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