Intrinsic and extrinsic nature of the orbital angular momentum of a light beam

被引：885

作者：

O'Neil, AT ^{[1
]}

MacVicar, I ^{[1
]}

Allen, L ^{[1
]}

Padgett, MJ ^{[1
]}

机构：

[1] Univ Glasgow, Dept Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland

来源：

PHYSICAL REVIEW LETTERS | 2002年 / 88卷 / 05期

关键词：

D O I：

10.1103/PhysRevLett.88.053601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We explain that, unlike the spin angular momentum of a. light beam which is always intrinsic, the orbital angular momentum may be either extrinsic or intrinsic. Numerical calculations of both spin and orbital angular momentum are confirmed by means of experiments with particles trapped off axis in optical tweezers, where the size of the particle means it interacts with only a fraction of the beam profile. Orbital angular momentum is intrinsic only when the interaction with matter is about an axis where there is no net transverse momentum.

引用

页数：4

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