Bigourdan Florian, Hugonin Jean-Paul, Lalanne Philippe
J Opt Soc Am A Opt Image Sci Vis. 2014 Jun 1;31(6):1303-11. doi: 10.1364/JOSAA.31.001303.
Modeling the field produced by a point-like dipole with an arbitrary location in the presence of a rotationally invariant nanostructure is an important issue in the context of designing nanoantennas. This is a challenging problem, as rotational symmetry is broken when introducing a noncentered dipole. Antennas larger than the wavelength are required for directivity, whereas the dipole-antenna distance is highly subwavelength, so there are two different length scales in the problem. In this paper, we introduce an original S-matrix approach based on an aperiodic-Fourier modal method. The potential of the technique is illustrated by considering three examples. We compare our results with a finite element technique.
在设计纳米天线的背景下，对存在旋转不变纳米结构时任意位置的点状偶极子所产生的场进行建模是一个重要问题。这是一个具有挑战性的问题，因为引入非中心偶极子会破坏旋转对称性。为了实现方向性，需要尺寸大于波长的天线，而偶极子与天线的距离远小于波长，因此该问题存在两种不同的长度尺度。在本文中，我们基于非周期傅里叶模态方法引入了一种原创的S矩阵方法。通过三个例子说明了该技术的潜力。我们将我们的结果与有限元技术进行了比较。
