期刊
JOURNAL OF OPTICS B-QUANTUM AND SEMICLASSICAL OPTICS
卷 4, 期 2, 页码 S82-S89出版社
IOP PUBLISHING LTD
DOI: 10.1088/1464-4266/4/2/373
关键词
orbital angular momentum density; Bessel light beams; optical tweezers
The orbital angular momentum density of Bessel beams is calculated explicitly within a rigorous vectorial treatment. This allows us to investigate some aspects that have not been analysed previously, such as the angular momentum content of azimuthally and radially polarized beams. Furthermore, we demonstrate experimentally the mechanical transfer of orbital angular momentum to trapped particles in optical tweezers using a high-order Bessel beam. We set transparent particles of known dimensions into rotation, where the sense of rotation can be reversed by changing the sign of the singularity. Quantitative results are obtained for rotation rates.
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