Institut d'Electronique Fondamentale, UMR 8622 CNRS-Université Paris-Sud, Bâtiment 220, 91405 Orsay Cedex, France.
Phys Rev Lett. 2013 Jun 28;110(26):263901. doi: 10.1103/PhysRevLett.110.263901.
We present the optical response of two interacting metallic nanowires calculated for separation distances down to angstrom range. State-of-the-art local and nonlocal approaches are compared with full quantum time-dependent density functional theory calculations that give an exact account of nonlocal and tunneling effects. We find that the quantum results are equivalent to those from classical approaches when the nanoparticle separation is defined as the separation between centroids of the screening charges. This establishes a universal plasmon ruler for subnanometric distances. Such a ruler not only impacts the basis of many applications of plasmonics, but also provides a robust rule for subnanometric metrology.
我们展示了两种相互作用的金属纳米线的光学响应，计算结果的分离距离达到了埃的范围。我们比较了最先进的局域和非局域方法与完全量子含时密度泛函理论计算，后者精确地考虑了非局域和隧道效应。我们发现，当纳米颗粒的分离定义为屏蔽电荷的质心之间的分离时，量子结果与经典方法的结果等效。这为亚纳米距离建立了一个通用的等离子体标尺。这个标尺不仅影响了等离子体学的许多应用的基础，而且为亚纳米计量学提供了一个可靠的规则。
