Open AccessOrbital angular moment of an electromagnetic Gaussian Schell-model beam with a twist phase
Author(s) -
Lin Liu,
YuSheng Huang,
Yahong Chen,
Lina Guo,
Yangjian Cai
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.030283
Subject(s) - physics , optics , angular momentum , beam (structure) , gaussian beam , light beam , m squared , thin lens , polarization (electrochemistry) , beam diameter , orbital angular momentum of light , lens (geology) , classical mechanics , total angular momentum quantum number , laser beams , laser , chemistry
We derive the analytical formula for the orbital angular momentum (OAM) flux of a stochastic electromagnetic beam carrying twist phase [i.e., twisted electromagnetic Gaussian Schell-model (TEGSM) beam] in the source plane with the help of the Wigner distribution function. Furthermore, we derive the general expression of the OAM flux of a TEGSM beam on propagation with the help of a tensor method. As numerical examples, we explore the evolution properties of the OAM flux of a TEGSM beam propagating through a cylindrical thin lens or a uniaxial crystal. It is found that the OAM flux of a TEGSM beam closely depends on its twist factors and degree of polarization in the source plane, and one can modulate the OAM flux of a TEGSM beam by a cylindrical thin lens or a uniaxial crystal. Our results may be useful in some applications, such as particle manipulation and free-space optical communications, where light beam with OAM is preferred.