Brokkelkamp Abel, van Heijst Sabrya E, Conesa-Boj Sonia
Kavli Institute of Nanoscience Delft University of Technology 2628 CJ Delft Netherlands.
Small Sci. 2025 Feb 13;5(5):2400558. doi: 10.1002/smsc.202400558. eCollection 2025 May.
Localized plasmon resonances in 2D transition metal dichalcogenides (TMDs) offer a powerful means to enhance light-matter interactions at the nanoscale, making them ideal candidates for advanced optoelectronic applications. However, disentangling the complex plasmonic interactions in these materials, especially in the low-energy regime, presents significant challenges. Herein, localized plasmon resonances in chemical vapor deposition-grown tungsten disulfide (WS) nanotriangles, using a combination of advanced spectral analysis and simulation techniques, is investigated. By combining non-negative matrix factorization with electron energy loss spectroscopy, distinct plasmonic modes to provide a comprehensive analysis of the plasmonic landscape of individual and stacked WS nanotriangles are identified and characterized. Furthermore, the dispersion relation of these localized plasmon resonances is quantified and their evolution across different WS triangular geometries is evaluated. Experimental characterization of plasmonic resonances in WS through dedicated numerical simulations based on the pygdm package is validated. The findings highlight the critical role of localized plasmon resonances in modulating the electronic and optical properties of WS, offering new insights into the design and optimization of TMD-based devices for optoelectronic and nanophotonic applications.
二维过渡金属二硫属化物（TMDs）中的局域等离激元共振提供了一种在纳米尺度上增强光与物质相互作用的强大手段，使其成为先进光电子应用的理想候选材料。然而，解析这些材料中复杂的等离激元相互作用，尤其是在低能量区域，面临着重大挑战。在此，利用先进的光谱分析和模拟技术相结合，对化学气相沉积生长的二硫化钨（WS）纳米三角形中的局域等离激元共振进行了研究。通过将非负矩阵分解与电子能量损失谱相结合，识别并表征了不同的等离激元模式，以全面分析单个和堆叠的WS纳米三角形的等离激元景观。此外，量化了这些局域等离激元共振的色散关系，并评估了它们在不同WS三角形几何形状中的演变。通过基于pygdm包的专用数值模拟对WS中等离激元共振的实验表征进行了验证。这些发现突出了局域等离激元共振在调节WS的电子和光学性质方面的关键作用，为基于TMD的光电子和纳米光子应用器件的设计和优化提供了新的见解。
