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2013-08-12
Orbital Angular Momentum Density of an Elegant Laguerre-Gaussian Beam
By
Progress In Electromagnetics Research, Vol. 141, 751-768, 2013
Abstract
Based on the method of the vectorial angular spectrum, an analytical expression of the electric field of an elegant Laguerre-Gaussian beam in free space is derived beyond the paraxial approximation, and the corresponding magnetic field is obtained by taking the curl of the electric field. By using the expressions for the electromagnetic fields, the expression of the orbital angular momentum density of the elegant Laguerre.Gaussian beam is derived, which is applicable to both the near and far fields. The effects of the three beam parameters on the distribution of the orbital angular momentum density of the elegant Laguerre-Gaussian beam are studied. The distribution of the orbital angular momentum density of the elegant Laguerre-Gaussian beam is also compared with that of the standard Laguerre-Gaussian beam. The result shows that the distribution of the orbital angular momentum density of the elegant Laguerre-Gaussian beam is more simple and centralized than that of the standard Laguerre-Gaussian beam.
Citation
Guoquan Zhou, and Guoyun Ru, "Orbital Angular Momentum Density of an Elegant Laguerre-Gaussian Beam," Progress In Electromagnetics Research, Vol. 141, 751-768, 2013.
doi:10.2528/PIER13051608
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