Light-induced electron dynamics in and around metallic nanostructures (A03)

由于光学近场操纵主要是通过在金属尖端周围和金属壁之间的纳米隙内采用场增强来实现的，因此本项目的活动致力于对这种等离子体结构内和周围的光演化进行精确的理论描述。目前，通常使用的有效材料模型在达到量子力学非定域性发挥作用的原子维度时会失效。这个项目中将要发展的理论将超越经典方案，从而包括金属中费米流体的量子效应和光学非线性。这支持了B3|Szeghalmi/Tünnermann和B4|Nolte/Zeitner项目中的实验，这些项目研究原子薄金属薄膜中的光致电子隧穿和非线性光学。它还支持正在处理极端等离子体场集中的C1|Huang/Popp和C2|Deckert/Pertsch项目。

Since optical near-field manipulation is mainly achieved by employing field enhancement around metallic tips and within nanogaps between metallic walls, the activities of this project are devoted to a precise theoretical description of light evolution within and around such plasmonic structures. Current, commonly used effective material models are known to fail when reaching atomic dimensions where quantum mechanical nonlocality comes into play. The theory to be developed in this project will go beyond classical schemes thus including quantum effects and optical nonlinearities of the Fermi fluid in metals. This supports experiments in projects B3|Szeghalmi/Tünnermann and B4|Nolte/Zeitner, which investigate light-induced electron tunneling and nonlin-ear optics in atomically thin metallic films. It also supports the projects C1|Huang/Popp and C2|Deckert/Pertsch which are dealing with extreme plasmonic field concentration.