期刊
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
卷 29, 期 1, 页码 32-43出版社
OPTICAL SOC AMER
DOI: 10.1364/JOSAA.29.000032
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- Singapore Ministry of Education [MOE2009-T2-2-086]
A multipole expansion, based on spherical harmonics, provides an efficient method for calculating the field in the focal region of a lens for radially polarized illumination, or other illumination polarization and phase distributions, including vortex beams. The multipole approach also has the benefit of providing a simple measure of the purity of the longitudinal field mode. The method is also convenient for calculation of fields scattered by particles and calculation of optical trapping forces. (C) 2011 Optical Society of America
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