Bethe衍射模型在圆锥几何中的推广：在近场光学中的应用
Extension of Bethe's diffraction model to conical Geometry: application to near field optics
摘要：
在近场扫描光学显微镜中使用的涂层锥形光纤尖端的辐射区，研究了Bethe双偶极子模型的一般性，通过一个亚波长孔在导电平面中的光衍射。为了从理论上描述针尖的角辐射功率，我们提出了一个简单的，小孔径（半径< 40 nm）的多极展开的基础上的分析模型。我们的模型能够重现现有的实验结果。它证明相对不敏感的锥角和孔径半径，并包含，作为第一近似，经验的两个偶极子模型提出较早。
英文摘要：
The generality of the Bethe's two dipole model for light diffraction through a subwavelength aperture in a conducting plane is studied in the radiation zone for coated conical fiber tips as those used in near field scanning optical microscopy. In order to describe the angular radiated power of the tip theoretically, we present a simple, analytical model for small apertures (radius < 40 nm) based on a multipole expansion. Our model is able to reproduce the available experimental results. It proves relatively insensitive to cone angle and aperture radius and contains, as a first approximation, the empirical two-dipole model proposed earlier.
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