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1 - Light beams carrying orbital angular momentum

Published online by Cambridge University Press:  05 December 2012

By
J. B. Götte  and
S. M. Barnett
Edited by
David L. Andrews  and
Mohamed Babiker
J. B. Götte
Affiliation:
University of Bristol
S. M. Barnett
Affiliation:
University of Strathclyde
David L. Andrews
Affiliation:
University of East Anglia
Mohamed Babiker
Affiliation:
University of York
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Summary

For optical fields the notion of a total angular momentum has long been known. The concept of a light beam carrying orbital angular momentum, however, was unfamiliar until it was discovered that Laguerre-Gaussian beams, within the paraxial approximation, carry a well-defined orbital angular momentum [1, 2]. This discovery started the modern interest in orbital angular momentum of light. In this chapter we discuss the theoretical framework of orbital angular momentum of light in terms of fields and light beams and how to generate these. The material in this chapter is based in parts on the PhD thesis of Götte [3].

Introduction

A quantitative treatment of the mechanical effects of light became possible only after light had been integrated into Maxwell's dynamical theory of electromagnetic waves. With this theory Poynting [4] derived a continuity equation for the energy in the electromagnetic field. After Heaviside [5, 6] introduced the vectorial notation for the Maxwell equations this continuity equation could be written in its modern form using the Poynting vector. Interestingly, the linear momentum density in the electromagnetic field is also given by the Poynting vector apart from constant factors depending on the chosen system of units. Poynting [7] also derived an expression for the angular momentum of circularly polarised light by means of a mechanical analogue in the form of a rotating shaft. Later, Poynting's expression was verified by measuring the torque on a quarter wave-plate due to circularly polarised light [8].

Type
Chapter
Information
The Angular Momentum of Light , pp. 1 - 30
Publisher: Cambridge University Press
Print publication year: 2012

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References

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