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Updated: Jan 21, 2026

Optical Trapping of Nanoparticles
Published on: January 15, 2013
Properties of a Tightly Focused Circularly Polarized Anomalous Vortex Beam and Its Optical Forces on Trapped
Yihua Bai1, Miao Dong1, Mingyan Zhang1
1School of Physics, University of Electronic Science and Technology of China, Chengdu, 610054, China.
Abstract:
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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