The creation of double tight focus by a concentric multi-belt pure phase filter
The creation of double tight focus by a concentric multi-belt pure phase filter
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通过同心多带纯相滤光片创建双紧焦点
DOI：
10.1016/j.optcom.2011.11.116
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发表时间：
2012-04
影响因子：
2.4
通讯作者：
Chen, Jiannong
中科院分区：
文献类型：
--
作者：
Xu, Qinfeng;Chen, Jiannong
我们提出了一种构造同心多带纯相位滤光片的方法，当径向偏振平面波通过大数值孔径物镜聚焦时，可以在轴上产生以纵向偏振分量为主的双紧聚焦。通过遮挡纯相位滤光片的中心部分和选择大数值孔径的物镜，可以获得两个可控间隔的亚波长纵向偏振焦斑。其半高全宽(FWHM)可能小于衍射限。它提供了一种精致的工具，可以稳定地捕获两个纳米尺寸的粒子，并将它们沿着光轴排列，或者通过通过化学键连接到分子上的微球来操纵生物分子。
We demonstrate a method of constructing a concentric multi-belt pure phase filter for creating double tight focus dominated by longitudinal polarized components on the axis when a radially polarized plane wave is focused by a high numerical aperture objective. By obstructing the central part of the pure phase filter and choosing the objective with large numerical aperture, we may obtain two sub-wavelength longitudinally polarized focal spots with controllable separation. Its full-width at half-maximum (FWHM) could be less than the diffraction limit. It provides an exquisite tool for stably trapping two nanometer-sized particles and aligning them along the optical axis or manipulating biological molecules through micro-spheres attached to the molecules by chemical bonds.
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影响因子：
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