Marchenko P, Orlov S, Huber C, Banzer P, Quabis S, Peschel U, Leuchs G
Max Planck Institute for the Science of Light, Günther-Scharowsky-Str. 1, D-91058 Erlangen, Germany.
Opt Express. 2011 Apr 11;19(8):7244-61. doi: 10.1364/OE.19.007244.
We investigate the interaction of highly focused linearly polarized optical beams with a metal knife-edge both theoretically and experimentally. A high numerical aperture objective focuses beams of various wavelengths onto samples of different sub-wavelength thicknesses made of several opaque and pure materials. The standard evaluation of the experimental data shows material and sample dependent spatial shifts of the reconstructed intensity distribution, where the orientation of the electric field with respect to the edge plays an important role. A deeper understanding of the interaction between the knife-edge and the incoming highly focused beam is gained in our theoretical model by considering eigenmodes of the metal-insulator-metal structure. We achieve good qualitative agreement of our numerical simulations with the experimental findings.
我们从理论和实验两方面研究了高度聚焦的线偏振光束与金属刀刃的相互作用。一个高数值孔径物镜将不同波长的光束聚焦到由几种不透明纯材料制成的不同亚波长厚度的样品上。对实验数据的标准评估表明，重建强度分布存在与材料和样品相关的空间偏移，其中电场相对于边缘的方向起着重要作用。在我们的理论模型中，通过考虑金属 - 绝缘体 - 金属结构的本征模，对刀刃与入射的高度聚焦光束之间的相互作用有了更深入的理解。我们的数值模拟与实验结果在定性上取得了良好的一致性。
