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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Formation of multiple focal spots using a high NA lens with a complex spiral phase mask
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Formation of multiple focal spots using a high NA lens with a complex spiral phase mask

机译:使用具有复杂螺旋相位掩模的高NA透镜形成多个焦点

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摘要

The formation of a transversally polarized beam by transmitting a tightly focused double-ringshaped azimuthally polarized beam through a complex spiral phase mask and high numerical aperture lens is presented based on vector diffraction theory. The generation of transversally polarized focal spot segment splitting and multiple focal spots is illustrated numerically. Moreover, we found that a properly designed complex spiral phase mask can move the focal spots along the optical axis in the z direction. Therefore, one can achieve a focal segment of two, three or multiple completely transversely polarized focal spots, which finds applications in optical trapping and in material processing technologies.
机译:基于矢量衍射理论,提出了一种将紧密聚焦的双环形方位偏振光束通过复杂的螺旋相位掩模和高数值孔径透镜透射而形成的横向偏振光束。数值地说明了横向极化焦点段分裂和多个焦点的产生。此外,我们发现设计合理的复杂螺旋相位掩模可以使焦点沿z方向的光轴移动。因此,人们可以实现两个,三个或多个完全横向偏振的焦点的焦段,这在光学陷波和材料加工技术中得到了应用。

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