Cao Zhaolou, Liu Wei, Sun Qi, Cui Fenping, Li Jinhua, Xian Fenglin, Pei Shixin, Liu Jia
Opt Express. 2022 Jan 17;30(2):1896-1906. doi: 10.1364/OE.447646.
We report the investigation on the lateral shifts that linearly-polarized (LP) and radially-polarized (RP) Bessel beams experience during the Mie scattering by a nanosphere. A numerical procedure based on the angular spectrum theory is developed to solve the scattered electromagnetic field and subsequent lateral shifts with a high computational efficiency, which can be easily applied to an arbitrary shaped polarized beam. The influences of different factors, including conical angle, nanosphere radius and position, on the lateral shifts are systematically investigated. The results demonstrate that for on-axis scattering, a LP Bessel beam can be regarded as a plane wave with the same polarization state but an equivalent longer wavelength, while a RP Bessel beam can be regarded as a plane wave with a polarization state along the propagation direction exhibiting independence on the conical angle. The findings help deepen our understandings of lateral shifts in light scattering of vectorial non-diffractive beams.
我们报告了关于线偏振（LP）和径向偏振（RP）贝塞尔光束在纳米球米氏散射过程中所经历的横向位移的研究。开发了一种基于角谱理论的数值方法，以高效地求解散射电磁场及后续的横向位移，该方法可轻松应用于任意形状的偏振光束。系统地研究了不同因素，包括圆锥角、纳米球半径和位置，对横向位移的影响。结果表明，对于轴上散射，LP贝塞尔光束可被视为具有相同偏振态但等效波长更长的平面波，而RP贝塞尔光束可被视为偏振态沿传播方向且与圆锥角无关的平面波。这些发现有助于加深我们对矢量非衍射光束光散射中横向位移的理解。
