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The generation of optical needle and magnetization needle with tunable longitudinal depth

机译:纵向深度可调的光针和磁化针的产生

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Based on vector diffraction theory and inverse Faraday effect, we report on the generation of optical needle and magnetization needle with tunable longitudinal depth by focusing a narrow annulus of azimuthally polarized beams using optmagnetic materials and an elliptical mirror. In this paper, we present the expression of the approximate result between the angular thickness A0 and the longitudinal depth when the annulus is assumed to be sufficiently narrow (Δθ«π/2). We theoretically demonstrate that the induced magnetization needle has the same longitudinal depth as optical needle, but with different distributions. The results are applied to the specific cases of the elliptical mirror and the parabolic mirror, then we further theoretically demonstrate that the longitudinal depth is equally long in the elliptical mirror focusing system and the parabolic mirror focusing system.
机译:基于矢量衍射理论和法拉第逆效应,我们报道了通过使用光磁材料和椭圆镜聚焦狭窄的方位角偏振光圈来产生纵向深度可调的光学针和磁化针的过程。在本文中,我们给出了假定环空足够窄(Δθ«π/ 2)时,角厚A0与纵向深度之间的近似结果的表达式。我们从理论上证明感应磁化针具有与光学针相同的纵向深度,但分布不同。将结果应用于椭圆镜和抛物面镜的特定情况,然后我们进一步从理论上证明椭圆镜聚焦系统和抛物面镜聚焦系统的纵向深度相等。

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