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Classical polarization multipoles: paraxial versus nonparaxial
KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum Electronics and Quantum Optics, QEO.ORCID iD: 0000-0002-2082-9583
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2015 (English)In: Physica Scripta, ISSN 0031-8949, E-ISSN 1402-4896, Vol. 90, no 7, 074030Article in journal (Refereed) Published
Abstract [en]

We discuss the polarization of paraxial and nonparaxial classical light fields by resorting to a multipole expansion of the corresponding polarization matrix. It turns out that only a dipolar term contributes when one considers SU(2) (paraxial) or SU(3) (nonparaxial) as fundamental symmetries. In this latter case, one can alternatively expand in SU(2) multipoles, and then both a dipolar and a quadrupolar component contribute, which explains the richer structure of this nonparaxial instance. These multipoles uniquely determine Wigner functions, in terms of which we examine some intriguing hallmarks arising in this classical scenario.

Place, publisher, year, edition, pages
2015. Vol. 90, no 7, 074030
Keyword [en]
polarisation, multipolar expansion, near fields
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-172497DOI: 10.1088/0031-8949/90/7/074030ISI: 000357541800031ScopusID: 2-s2.0-84936870964OAI: diva2:848579
The Swedish Foundation for International Cooperation in Research and Higher Education (STINT)Swedish Research CouncilEU, FP7, Seventh Framework ProgrammeWenner-Gren Foundations

QC 20150825

Available from: 2015-08-25 Created: 2015-08-25 Last updated: 2015-08-25Bibliographically approved

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Björk, Gunnar
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