Affiliation:
1. University of Shanghai for Science and Technology
2. Shanghai Pudong New Area People’s Hospital
Abstract
We investigate the tight-focusing properties of propagable fractional-order vector vortex beams (VVBs). The superposition of the phase singularity from optical vortices (OVs) and polarization singularity from VVBs plays a significant role in creating propagable fractional-order VVBs. Applying this unique characteristic, we derive an integrated analytical model to calculate the tight-focused electromagnetic fields and Poynting vector distributions based on the Richards–Wolf vector diffraction integral. The results show that the tight-focusing intensity of fractional-order VVBs exhibits uniaxial symmetric distribution, in which an odd number of petals with non-uniform amplitude occurs as the beams pass through the polarizer. In contrast to classical integer-order OVs with homogeneously polarized states, propagable fractional-order VVBs show semi-circular patterns with different directions after the polarizer, owing to their intriguing polarization distributions. Besides, to deeply understand the focusing characteristics of the calculated fractional-order VVBs, the influence of different-order carrier VVBs and OVs is studied in detail. These results might provide a valuable reference for particle manipulation and optical trapping.
Funder
National Key Research and Development Program of China
Project of Clinical Outstanding Clinical Discipline Construction in Shanghai Pudong New Area
Subject
Atomic and Molecular Physics, and Optics,Statistical and Nonlinear Physics
Cited by
1 articles.
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