Optical angular momentum in atomic transitions: a paradox

被引：10

作者：

Barnett, Stephen M. ^{[1
]}

Speirits, Fiona C. ^{[1
]}

Babiker, Mohamed ^{[2
]}

机构：

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

[2] Univ York, Dept Phys, York YO10 5DD, N Yorkshire, England

来源：

JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL | 2022年 / 55卷 / 23期

关键词：

optical angular momentum; atomic transitions; quadrupole transitions; ROTATION;

D O I：

10.1088/1751-8121/ac6bd1

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Stated simply the paradox is as follows: it is clear that the orbital angular momentum of a light beam in its direction of propagation is an intrinsic quantity, and therefore has the same value everywhere in the beam. How then can a Gaussian beam, with precisely zero orbital angular momentum, drive a (single-photon) quadrupole transition which requires the transfer of angular momentum 2PLANCK CONSTANT OVER TWO PI to an absorbing atom?

引用

页数：13

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