Journal
OPTICS COMMUNICATIONS
Volume 505, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.optcom.2021.127514
Keywords
Polarization; Cylindrical vector beams; Diffraction theory; Singular optics; Propagation
Categories
Funding
- National Natural Science Foundation of China [11774055, 12074066]
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This paper introduces a double-mode concentric annular fractional vector beam, and the results show that fractional topological coefficients have a high degree of freedom, emphasizing the important connection between fractional coefficients and SAM density through experimental results.
Integer-order vector beams maintain their polarization properties under the paraxial diffraction condition. Fractional-order vector beam with irregular phase change that leading to changeable focusing properties has aroused huge interest research. Herein, we proposed and experimentally generated a double-mode concentric annular fractional vector beam. Based on the modal superposition, the intensity and spin angular momentum (SAM) density are characterized by periodic changes from rotational symmetry to axial symmetry as the topological coefficient increases. These results reveal that the fractional topological coefficients have a great potential degree of freedom. The experimental results are exploited in this work to emphasize the important connection between fractional coefficient and SAM density.
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