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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Vol. 20, Iss. 12 — Dec. 1, 2003
  • pp: 2385–2389

Evanescent and propagating fields of a strongly focused beam

Nikolai I. Petrov  »View Author Affiliations


JOSA A, Vol. 20, Issue 12, pp. 2385-2389 (2003)
http://dx.doi.org/10.1364/JOSAA.20.002385


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Abstract

Evanescent- and propagating-field distributions from a strongly-focused-wave beam with subwavelength waist wa≪λ 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

OCIS Codes
(260.1960) Physical optics : Diffraction theory
(260.2110) Physical optics : Electromagnetic optics
(350.5500) Other areas of optics : Propagation
(350.7420) Other areas of optics : Waves

Citation
Nikolai I. Petrov, "Evanescent and propagating fields of a strongly focused beam," J. Opt. Soc. Am. A 20, 2385-2389 (2003)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-20-12-2385


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