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10 May 2010 On the definition of beam width of highly-focused radially-polarized light fields
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Abstract
Analytical definitions are proposed for the width of both the transverse and the longitudinal component of a nonparaxial radially-polarized light field at the focal plane of a highly focusing system. By means of an illustrative example, it is also shown that the irradiance is significant within a circle whose radius is given by the proposed beam width. Moreover, the power contained within such circular region around the focal point is shown to concentrate the main part of the total power.
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R. Martínez-Herrero, P. M. Mejías, and A. Manjavacas "On the definition of beam width of highly-focused radially-polarized light fields", Proc. SPIE 7712, Nanophotonics III, 77122K (10 May 2010); https://doi.org/10.1117/12.854213
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