Angular momentum of light | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-04

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Angular_momentum_of_light


00:00:55 1 Introduction
00:03:27 2 Mathematical expressions for the angular momentum of light
00:11:54 3 Exchange of spin and orbital angular momentum with matter
00:13:16 3.1 Spiral Phase Plate (SPP)
00:13:44 3.2 Pitch-Fork Hologram
00:14:10 3.3 Q-Plate
00:14:46 3.4 Cylindrical Mode Converters
00:15:16 4 Possible applications of the orbital angular momentum of light



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Voice name: en-US-Wavenet-A


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SUMMARY
=======
The angular momentum of light is a vector quantity that expresses the amount of dynamical rotation present in the electromagnetic field of the light. While traveling approximately in a straight line, a beam of light can also be rotating (or “spinning”, or “twisting”) around its own axis.  This rotation, while not visible to the naked eye, can be revealed by the interaction of the light beam with matter.
There are two distinct forms of rotation of a light beam, one involving its polarization and the other its wavefront shape. These two forms of rotation are therefore associated with two distinct forms of angular momentum, respectively named light spin angular momentum (SAM) and light orbital angular momentum (OAM).
The total angular momentum of light (or, more generally, of the electromagnetic field and the other force fields) and matter is conserved in time.