Multipole expansion of strongly focussed laser beams

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dc.creatorNieminen, T. A.
dc.creatorRubinsztein-Dunlop, H.
dc.creatorHeckenberg, N. R.
dc.date2003-08-29
dc.date.accessioned2026-07-07T05:49:55Z
dc.date.available2026-07-07T05:49:55Z
dc.descriptionMultipole expansion of an incident radiation field - that is, representation of the fields as sums of vector spherical wavefunctions - is essential for theoretical light scattering methods such as the T-matrix method and generalised Lorenz-Mie theory (GLMT). In general, it is theoretically straightforward to find a vector spherical wavefunction representation of an arbitrary radiation field. For example, a simple formula results in the useful case of an incident plane wave. Laser beams present some difficulties. These problems are not a result of any deficiency in the basic process of spherical wavefunction expansion, but are due to the fact that laser beams, in their standard representations, are not radiation fields, but only approximations of radiation fields. This results from the standard laser beam representations being solutions to the paraxial scalar wave equation. We present an efficient method for determining the multipole representation of an arbitrary focussed beam.
dc.description13 pages, 7 figures
dc.identifierhttps://arxiv.org/abs/physics/0308111
dc.identifierhttp://arxiv.org/abs/physics/0308111
dc.identifierJournal of Quantitative Spectroscopy and Radiative Transfer 79-80, 1005-1017 (2003)
dc.identifierdoi:10.1016/S0022-4073(02)00335-7
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/85561
dc.subjectOptics
dc.titleMultipole expansion of strongly focussed laser beams
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