Modelling of magnetic effects in near-field optics |
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Authors: | U Schröter |
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Institution: | 1.Fachbereich Physik, Universit?t Konstanz, Universit?tsstrasse 10, 78457 Konstanz, Germany,DE |
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Abstract: | Green's dyadic technique represents a powerful tool for calculations in electrodynamics, especially in modelling optical properties
of nanoscopic objects. The method does not only provide field distributions, but also maps of susceptibilities and densities
of states. Whereas the formalism is well established for dielectrics and electric fields, I present here a straight forward
extension to tensors of both electric and magnetic type as well as mixed ones and furthermore to the situation where objects
with dielectric and magnetic permeabilities are present together. As examples, characteristic field patterns are compared
for elementary dielectric and magnetic perturbations. Green's tensors calculated for a coral structure reveal that mixed susceptibilities
can exhibit other symmetries than pure electric or magnetic ones. Maps of all tensor components can thus give essential clues
to the interpretation of near-field images.
Received 15 December 2002 Published online 20 June 2003
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ID="a"Files “maths.ps” and “tensors.ps” are only available in electronic form at http://www.edpsciences.org
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ID="b"e-mail: Ursula.Schroeter@uni-konstanz.de |
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Keywords: | PACS 41 20 -q Applied classical electromagnetism – 78 20 Bh Theory models and numerical simulation – 02 60 Cb Numerical simulation solution of equations |
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