Journal
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
Volume 284, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jqsrt.2022.108167
Keywords
Angular spectrum representation; Localized approximation; Beam shape coefficient; Bessel-Gauss beam
Categories
Funding
- National Council for Scientific and Technological Development (CNPq) [426990/2018-8, 307898:2018-0]
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This study discusses the connection between the angular spectrum decomposition (ASD) method and the quadrature method of the generalized Lorenz-Mie theory (GLMT) using the angular spectrum representation of the vector Bessel-Gauss beam. The validity of the approximate method for evaluating the beam shape coefficients (BSCs) is numerically studied based on the beam's angular spectrum and the off-axis distance.
The angular spectrum representation of the vector Bessel-Gauss beam is used for discussing the connection between the angular spectrum decomposition (ASD) method and the quadrature method of the generalized Lorenz-Mie theory (GLMT). Under the paraxial condition, the beam shape coefficients (BSCs) obtained in the ASD method can be approximated to the same expressions as those obtained in the localized approximation method. The validity of the approximate method for evaluating the BSCs is numerically studied, based on both the beam's angular spectrum and the off-axis distance. (c) 2022 Elsevier Ltd. All rights reserved.
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