Journal
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
Volume 204, Issue -, Pages 27-34Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jqsrt.2017.08.022
Keywords
Beam shape coefficients; Zeroth-order Mathieu beams; Generalized Lorenz-Mie theory
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Funding
- FAPESP [2016/11174-8]
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In a recent paper on radiation pressure forces exerted on a homogenous spherical particle by zeroth-order Mathieu beams (zMBs), the integral localized approximation(ILA) was used to calculate the beam shape coefficients (BSCs) encoding the shape of the beams. Unfortunately, this method is valid only for beams with a propagating factor exp (+/- ikz). In the case of non-diffracting beams the propagation factor is exp (+/- ikcos alpha z) which involves an extra-cosine term, with a being the axicon angle. Due to this term it has been demonstrated that localized approximations, including ILA, provide a satisfactory description of the intended beam only if the axicon angle is small enough. Zeroth-order Mathieu beams pertain to this type of beams. The present paper is therefore devoted to a comparison between BSCs calculated with an exact procedure and those calculated using ILA, in order to determine a range of validity of the approximate procedure. As a side result, we also establish exact closed-form expressions to the evaluation of BSCs of zMBs. (C) 2017 Elsevier Ltd. All rights reserved.
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