Based on the vector diffraction theory and partial coherence theory,analytical expressions of the tightly focused partially coherent circularly polarized anomalous vortex beam are derived.Simulation results show the tight focusing properties are strongly dependent on the optical parameters of incident beam and numerical aperture(NA)value.In particular,the spin direction,NA value and the topological charge can be used to modulate the beam profile,whereas the beam order and coherence length only affect the maximal intensity.The spin angular momentum can be transformed into the orbital angular momentum along the axial component after tight focusing.Besides,for left-handed circular polarization,the optical forces of such beam on metallic Rayleigh particles are studied.The results show such a beam can trap metallic Rayleigh particles,which exhibit potential applications on optical tweezers.
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董淼,姚骏,白毅华.部分相干圆偏振反常涡旋光束的紧聚焦及辐射力研究[J].激光与红外,2021,51(4):502~508 DONG Miao, YAO Jun, BAI Yi-hua. The tight focusing of partially coherent circularly polarized anomalous vortex beam and its optical forces[J]. LASER & INFRARED,2021,51(4):502~508