自组装WS2金字塔的形貌诱导光谱修正
Morphology-induced spectral modification of self-assembled WS2 pyramids
摘要：
二维过渡金属二硫属化合物（2D-TMDs）由于其独特的光学性质，包括稳定的手性激子，在纳米光子学领域有着广阔的应用前景。化学气相沉积（CVD）技术提供了一个平台，以制造和设计具有不同几何形状的纳米结构。然而，生长的纳米几何学越奇特，对其光学响应的了解就越少。WS 2纳米结构的几何形状范围从单层到中空金字塔已被创建。空心金字塔表现出强烈减少的光致发光相对于水平分层的二硫化钨，促进其清晰的拉曼信号的研究更详细。在共振激发下，空心金字塔呈现出大量的高阶声子共振。与单层膜相比，金字塔的光学响应的光谱特征是位置相关的。峰强度、峰比和光谱峰位置的差异揭示了中空金字塔坑和侧面原子排列的局部变化。空心WS 2金字塔的位置相关的光学响应的特征在于，并归因于生长诱导的纳米几何。因此，第一步是朝着生产可调纳米光子器件，应用范围从光电子到非线性光学。
英文摘要：
Due to their intriguing optical properties, including stable and chiral excitons, two-dimensional transition metal dichalcogenides (2D-TMDs) hold the promise of applications in nanophotonics. Chemical vapor deposition (CVD) techniques offer a platform to fabricate and design nanostructures with diverse geometries. However, the more exotic the grown nanogeometry, the less is known about its optical response. WS2 nanostructures with geometries ranging from monolayers to hollow pyramids have been created. The hollow pyramids exhibit a strongly reduced photoluminescence with respect to horizontally layered tungsten disulphide, facilitating the study of their clear Raman signal in more detail. Excited resonantly, the hollow pyramids exhibit a great number of higher-order phononic resonances. In contrast to monolayers, the spectral features of the optical response of the pyramids are position dependent. Differences in peak intensity, peak ratio and spectral peak positions reveal local variations in the atomic arrangement of the hollow pyramids crater and sides. The position-dependent optical response of hollow WS2 pyramids is characterized and attributed to growth-induced nanogeometry. Thereby the first steps are taken towards producing tunable nanophotonic devices with applications ranging from opto-electronics to non-linear optics.
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