Optics beyond the diffraction limit
نویسنده
چکیده
In this lecture, we introduce the basic concepts of near-field optics using two different points of view: the plane-wave angular spectrum and the electric-dipole radiation. The first approach leads naturally to the diffraction limit and to the concepts of evanescent waves and near field. The second approach shows that the basic laws of electromagnetic radiation also lead to the classical resolution limit, and allows to introduce the near-field concept based on the quasi-static approximation. In the last part, we discuss the problem of the fluorescence of a single atom close to a nano-object, based on a simple classical model. This is a key issue in nano-optics, and some important features are put forward, using the tools and ideas introduced in the section devoted to dipole radiation.
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