Decomposition of the Point-Dipole Field into Homogeneous and Evanescent Parts

T. Setälä, M. Kaivola, A. Friberg

Research output: Contribution to journalArticleScientificpeer-review

47 Citations (Scopus)
136 Downloads (Pure)

Abstract

In near-field optics the resolution and sensitivity of measurements depend on the abundance of evanescent waves in relation to propagating waves. The electromagnetic field propagator is related to the scalar spherical wave, for which the Weyl expansion is a half-space representation containing both evanescent and homogeneous plane waves. Making use of these results, we decompose the dyadic free-space Green function into its evanescent and homogeneous parts and show that some approaches put forward in the literature are inconsistent with this formulation. We express the results in a form that is suitable for numerical computation and illustrate the field decomposition for a point dipole in some typical cases.
Original languageEnglish
Pages (from-to)1200-1206
Number of pages7
JournalPhysical Review E
Volume59
Issue number1
DOIs
Publication statusPublished - 1 Jan 1999
MoE publication typeA1 Journal article-refereed

Keywords

  • evanescent field
  • green function
  • point dipole

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