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Evanescent and propagating fields of a strongly focused beam

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Abstract

Evanescent- and propagating-field distributions from a strongly-focused-wave beam with subwavelength waist waλ as a function of polar angle and distance are investigated. Exact amplitudes and intensities of evanescent Eev and propagating Ep fields, including interference terms, are presented both in near- and far-field regions. It is shown that the amplitude of Eev decays as exp(-r/wa) in the near-field region and that evanescent waves do not contribute to the far field in the forward direction as they do in the transverse directions θ=π/2, even though the oscillating evanescent field of the same strength but opposite in sign to the propagating field exists in the transverse plane.

© 2003 Optical Society of America

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