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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 33, Iss. 13 — Jul. 1, 2008
  • pp: 1446–1448

Subwavelength displacement of the far-field image of a radiating dipole

Henk F. Arnoldus, Xin Li, and Jie Shu  »View Author Affiliations

Optics Letters, Vol. 33, Issue 13, pp. 1446-1448 (2008)

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The field lines of the Poynting vector for light emitted by a dipole with a rotating dipole moment show a vortex pattern near the location of the dipole. In the far field, each field line approaches a straight line, but this line does not appear to come exactly from the location of the dipole. As a result, the image of the dipole in its plane of rotation seems displaced. Secondly, the image in the far field is displaced as compared with the image of a source for which the field lines run radially outward. It turns out that both image displacements are the same. The displacements are of subwavelength scale, and they depend on the angles of observation. The maximum displacement occurs for observation in the plane of rotation and equals λ π , where λ is the wavelength of the light.

© 2008 Optical Society of America

OCIS Codes
(080.1510) Geometric optics : Propagation methods
(260.2110) Physical optics : Electromagnetic optics
(080.1235) Geometric optics : Apparent images
(080.4865) Geometric optics : Optical vortices

ToC Category:
Physical Optics

Original Manuscript: December 11, 2007
Revised Manuscript: April 3, 2008
Manuscript Accepted: May 20, 2008
Published: June 23, 2008

Henk F. Arnoldus, Xin Li, and Jie Shu, "Subwavelength displacement of the far-field image of a radiating dipole," Opt. Lett. 33, 1446-1448 (2008)

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  2. J. D. Jackson, Classical Electrodynamics, 3rd ed. (Wiley, 1999), Secs. 9.2 and 9.3.
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