Angular momentum of a strongly focused Gaussian beam

被引：138

作者：

Nieminen, Timo A. ^{[1
]}

Stilgoe, Alexander B. ^{[1
]}

Heckenberg, Norman R. ^{[1
]}

Rubinsztein-Dunlop, Halina ^{[1
]}

机构：

[1] Univ Queensland, Sch Phys Sci, Ctr Biophoton & Laser Sci, Brisbane, Qld 4072, Australia

来源：

JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS | 2008年 / 10卷 / 11期

关键词：

optical vortices; orbital angular momentum; non-paraxial beams;

D O I：

10.1088/1464-4258/10/11/115005

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A circularly polarized paraxial Gaussian laser beam carries +/- h angular momentum per photon as spin, with zero orbital angular momentum. Focusing the beam with a rotationally symmetric lens cannot change this angular momentum flux, yet the focused beam must have spin vertical bar S(z)vertical bar < h per photon. The remainder of the original spin is converted to orbital angular momentum, manifesting itself as a longitudinal optical vortex at the focus. We investigate the nature of this orbital angular momentum.

引用

页数：6

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