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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Editor: Stephen A. Burns
  • Vol. 26, Iss. 2 — Feb. 1, 2009
  • pp: 395–402

Nanoscale shift of the intensity distribution of dipole radiation

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

JOSA A, Vol. 26, Issue 2, pp. 395-402 (2009)

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The energy flow lines (field lines of the Poynting vector) for radiation emitted by a dipole are in general curves, rather than straight lines. For a linear dipole the field lines are straight, but when the dipole moment of a source rotates, the field lines wind numerous times around an axis, which is perpendicular to the plane of rotation, before asymptotically approaching a straight line. We consider an elliptical dipole moment, representing the most general state of oscillation, and this includes the linear dipole as a special case. Due to the spiraling near the source, for the case of a rotating dipole moment, the field lines in the far field are displaced with respect to the outward radial direction, and this leads to a shift of the intensity distribution of the radiation in the far field. This shift is shown to be independent of the distance to the source and, although of nanoscale dimension, should be experimentally observable.

© 2009 Optical Society of America

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

Original Manuscript: October 9, 2008
Revised Manuscript: December 3, 2008
Manuscript Accepted: December 5, 2008
Published: January 29, 2009

Jie Shu, Xin Li, and Henk F. Arnoldus, "Nanoscale shift of the intensity distribution of dipole radiation," J. Opt. Soc. Am. A 26, 395-402 (2009)

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