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

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date

1999-01-01

Department

Department of Applied Physics

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Language

en

Pages

7
1200-1206

Series

PHYSICAL REVIEW E, Volume 59, issue 1

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.

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Keywords

evanescent field, green function, point dipole

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DOI

10.1103/PhysRevE.59.1200

Citation

Setälä , T , Kaivola , M & Friberg , A 1999 , ' Decomposition of the Point-Dipole Field into Homogeneous and Evanescent Parts ' , Physical Review E , vol. 59 , no. 1 , pp. 1200-1206 . https://doi.org/10.1103/PhysRevE.59.1200

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https://urn.fi/URN:NBN:fi:aalto-201805222525

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[article-cris] Perustieteiden korkeakoulu / SCI