Configurational resonances in optical near-field microscopy: a rigorous point-dipole approach

Abstract:

A theoretical analysis of the framework for near-field microscopy based on a microscopic description of the interaction between the dielectric probe and the surface is presented. The probe tip is assumed to be a point-like sphere and the surface (selvedge) is represented by point-like spheres placed on a two-dimensional lattice. The bulk is treated as a homogeneous continuum. Using a Green's function formalism we have established a set of self-consistent algebraic equations to describe the local field at the sites of the probe tip and the selvedge. All contributions including bulk reflection and many-body interactions have been taken into account. By means of a point-dipole approach we have for N dipoles solved the 3N × 3N linear algebraic equations exactly. The results have been compared with approximate solutions obtained by a Born series expansion. We have found that the approximate solutions are very …

Año de publicación:

1993

Keywords:

Fuente:

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