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NEAR-FIELD AND FAR-FIELDMODELLING OF SURFACEWAVES SCATTERED BY AFM TIP

DOI: 10.1615/ICHMT.2010.RAD-6.120
10 pages

Jerome Muller
LEMTA (Laboratoire d’Energétique et de Mécanique Théorique et Appliquée) CNRS UMR 7563 - Nancy Université Faculté des Sciences et Techniques BP 70239 - 54506 VANDOEUVRE Cedex - FRANCE

Gilles Parent
Laboratoire Energies et Mecanique Theorique et Appliquee (LEMTA), Universite de Lorraine-CNRS, UMR 7563, Vandoeuvre-les-Nancy 54505, France

Sebastien Fumeron
LEMTA-INPL, University de Lorraine

Gerard Jeandel
LEMTA, Nancy-Université, CNRS, Faculté des Sciences et Techniques, France

David Lacroix
LEMTA (Laboratoire d'Energéetique et de Mécanique Théorique et Appliquée), CNRS UMR 7563 - Université Henri Poincaré, Nancy 1, Faculté des Sciences et Techniques BP 239 - 54506 VANDCEUVRE Cedex, France

Resumo

The detection of surface waves through scanning near-field optical microscopy (SNOM) is a promising technique for thermal measurements at very small scales. Recent studies have shown that electromagnetic waves, in the vicinity of a scattering structure such as an atomic force microscopy (AFM) tip, can be scattered from near to far-field and thus detected. In the present work, a model based on the finite difference time domain (FDTD) method and the near-field to far-field (NFTFF) transformation for electromagnetic waves propagation is presented. This model has been validated by studying the electromagnetic field of a dipole in vacuum and close to a dielectric substrate. Then simulations for a tetrahedral tip close to an interface are presented and discussed.

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