自旋波的Luneburg透镜
A Luneburg lens for spin waves
摘要：
我们报告的前体积静磁自旋波的Luneburg透镜的理论，并通过微磁建模验证其操作。透镜通过设计的渐变折射率将平面波转换为点源（反之亦然），这里通过调制圆形区域中的厚度或饱和磁化来实现。我们发现，透镜使波的振幅在透镜焦点处增强了5倍，并且47%的入射能量到达焦点区域。此外，如果透镜折射率平滑地分级，则轮廓中的小偏差仍然可以导致良好的聚焦。
英文摘要：
We report on the theory of a Luneburg lens for forward-volume magnetostatic spin waves, and verify its operation via micromagnetic modelling. The lens converts a plane wave to a point source (and vice versa) by a designed graded index, realised here by either modulating the thickness or the saturation magnetization in a circular region. We find that the lens enhances the wave amplitude by 5 times at the lens focus, and 47% of the incident energy arrives in the focus region. Furthermore, small deviations in the profile can still result in good focusing, if the lens index is graded smoothly.
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