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Optical angular momentum in classical electrodynamics

机译:古典电动力学中的光学角度

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摘要

Invoking Maxwell's classical equations in conjunction with expressions for the electromagnetic (EM) energy, momentum, force, and torque, we use a few simple examples to demonstrate the nature of the EM angular momentum. The energy and the angular momentum of an EM field will be shown to have an intimate relationship; a source radiating EM angular momentum will, of necessity, pick up an equal but opposite amount of mechanical angular momentum; and the spin and orbital angular momenta of the EM field, when absorbed by a small particle, will be seen to elicit different responses from the particle.
机译:用电磁(EM)能量,动量,力和扭矩的表达式调用Maxwell的经典方程,我们使用一些简单的例子来证明EM角动量的性质。 EM场的能量和角度动量将显示有一个亲密关系; 源辐射EM角动量将是必要的,拾取相等但相反的机械角动量; 和EM场的旋转和轨道角动量在由小颗粒吸收时,将被视为从颗粒中引出不同的反应。

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