Improving the trapping capability using radially polarized narrow-width annular beam
Improving the trapping capability using radially polarized narrow-width annular beam
复制标题
使用径向偏振窄宽度环形光束提高捕获能力
DOI：
10.1080/09500340.2014.922634
复制
发表时间：
2016-03
影响因子：
1.3
通讯作者：
Huang, Wei
中科院分区：
文献类型：
--
作者：
Xu, Hua-Feng;Zhang, Wei-Jun;Qu, Jun;Huang, Wei
提出了一种利用径向偏振的窄宽度环形光束（NWAB）提高光阱捕获能力的新方法。在本文中，我们从理论上研究了径向偏振NWAB的紧聚焦特性，通过巧妙地阻止径向偏振贝塞尔-高斯光束（原始甜甜圈光束）的中心部分，通过高数值孔径物镜形成。结果表明，在焦点附近可形成焦深（约）的亚波长焦斑（）。此外，光捕获力作用在金属瑞利粒子的情况下，径向偏振环形光束被施加计算。数值结果表明，径向极化的非线性波束与原来的环形波束相比，可以大大提高横向陷阱刚度，拓宽纵向陷阱范围。详细研究了环形因子δ对聚焦特性和陷阱刚度的影响。
A novel optical-trap method for improving the trapping capability using a radially polarized narrow-width annular beam (NWAB) has been proposed. In this paper, we theoretically study the tight focusing properties of a radially polarized NWAB, formed by subtly blocking the central portion of a radially polarized Bessel–Gaussian beam (the original doughnut beam), through a high-numerical aperture objective. It is shown that a sub-wavelength focal spot () with a quite long depth of focus (about ) can be formed in the vicinity of the focus. Furthermore, the optical trapping forces acting on a metallic Rayleigh particle are calculated for the case where a radially polarized annular beam is applied. Numerical results show that the radially polarized NWAB can largely enhance the transverse trap stiffness and broaden the longitudinal trap range compared with the usage of the original doughnut beam. The influence of the annular factor δ on the focusing properties and the trap stiffness is investigated in detail.
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影响因子：
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