期刊
JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS
卷 10, 期 3, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1464-4258/10/3/035005
关键词
poynting; rays; diffraction
类别
Energy trajectories, that is, integral curves of the Poynting ( current) vector, are calculated for scalar Bessel and Laguerre-Gauss beams carrying orbital angular momentum. The trajectories for the exact waves are helices, winding on cylinders for Bessel beams and hyperboloidal surfaces for Laguerre-Gauss beams. In the geometrical optics approximations, the trajectories for both types of beam are overlapping families of straight skew rays lying on hyperboloidal surfaces; the envelopes of the hyperboloids are the caustics: a cylinder for Bessel beams and two hyperboloids for Laguerre-Gauss beams.
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