Geometrical Engineering of Giant Optical Dichroism in Rippled MoS2 Nanosheets
ADVANCED OPTICAL MATERIALS(2021)
摘要
A cost effective method to tailor the optical response of large-area nanosheets of 2D materials is described. A reduced effective metalayer model is introduced to capture the key-role of the out-of-plane component of the dielectric tensor. Such a model indicates that the optical extinction of 2D materials can be strongly altered by controlling the geometry at the local (i.e., subwavelength) scale. In particular, a giant linear optical dichroism at normal incidence is demonstrated, with major features around the excitonic peaks, that can be tailored by acting on the average curvature and slope of the nanosheets. The approach is experimentally demonstrated in few-layer MoS2 grown by chemical vapor deposition on cm-scale anisotropic nanopatterned substrates prepared by a self-assembling technique, based on defocused ion beam sputtering. Major variations in the photoluminescence spectrum as a function of the average curvature and slope are also revealed. A full-vectorial numerical study beyond the effective metalayer model and comprising strain effects induced by the geometry turns out to be consistent with such a complex scenario. The results demonstrate that the extrinsic geometrical engineering definitely opens viable way to tailor the optical properties and modulate bandgap of low dimensional materials.
更多查看译文
关键词
2D materials,giant optical dichroism,MoS2 nanosheets,nanopatterning,self‐,assembling
AI 理解论文
溯源树
样例
![](https://originalfileserver.aminer.cn/sys/aminer/pubs/mrt_preview.jpeg)
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要