Properties of a Tightly Focused Circularly Polarized Anomalous Vortex Beam and Its Optical Forces on Trapped Nanoparticles

被引：0
|
作者：
Yihua Bai
Miao Dong
Mingyan Zhang
Yuanjie Yang
机构：
[1] University of Electronic Science and Technology of China,School of Physics
来源：
Nanoscale Research Letters | 2019年 / 14卷
关键词：
Nanoparticles; Optical trapping; Circularly polarized anomalous vortex beam;
D O I：
暂无
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学科分类号：
摘要：
The characteristics of a circularly polarized anomalous vortex beam (CPAVB), focused by an objective lens with a high numerical aperture (NA), are studied analytically and theoretically. It shows that the topological charge can affect the beam profile significantly and a flat-topped (FT) beam can be obtained by modulating the NA and topological charge. It is interesting to find that spin-to-orbital angular momentum conversion can occur in the longitudinal component after tight focusing. Furthermore, optical forces of the tightly focused CPAVB on nanoparticles are analyzed in detail. It can be expected to trap two kinds of nanoparticles using such beam near the focus.
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