高聚焦矢量光束与金属刀口的相互作用
Interaction of highly focused vector beams with a metal knife-edge
摘要：
从理论和实验两方面研究了高聚焦线偏振光束与金属刀口的相互作用。高数值孔径物镜将各种波长的光束聚焦到由几种不透明和纯材料制成的不同亚波长厚度的样品上。实验数据的标准评估示出了重构强度分布的材料和样品相关的空间移位，其中电场相对于边缘的取向起着重要作用。通过考虑金属-绝缘体-金属结构的本征模，在我们的理论模型中获得了对刀口和入射高聚焦光束之间相互作用的更深入的理解。我们实现了良好的定性协议，我们的数值模拟与实验结果。
英文摘要：
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 focusses 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.
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