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10 - Dipole emission near planar interfaces

Published online by Cambridge University Press:  05 November 2012

Lukas Novotny  and
Bert Hecht
Lukas Novotny
Affiliation:
University of Rochester, New York and ETH Zürich, Switzerland
Bert Hecht
Affiliation:
Julius-Maximilians-Universität Würzburg, Germany
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Summary

The problem of dipole radiation in or near planar layered media is of significance to many fields of study. It is encountered in antenna theory, single-molecule spectroscopy, cavity quantum electrodynamics, integrated optics, circuit design (microstrips), and surface-contamination control. The relevant theory was also applied to explain the strongly enhanced Raman effect of adsorbed molecules on noble metal surfaces, and in surface science and electrochemistry for the study of optical properties of molecular systems adsorbed on solid surfaces. Detailed literature on the latter topic is given in Ref. [1]. In the context of nano-optics, dipoles close to a planar interface have been considered by various authors to simulate tiny light sources and small scattering particles [2]. The acoustic analog is also applied to a number of problems such as seismic investigations and ultrasonic detection of defects in materials [3].

In his original paper [4], in 1909, Sommerfeld developed a theory for a radiating dipole oriented vertically above a planar and lossy ground. He found two different asymptotic solutions: space waves (spherical waves) and surface waves. The latter had already been investigated by Zenneck [5]. Sommerfeld concluded that surface waves account for longdistance radio-wave transmission because of their slower radial decay along the Earth's surface compared with that of space waves. Later, when space waves were found to reflect at the ionosphere, the contrary was confirmed. Nevertheless, Sommerfeld's theory formed the basis for all subsequent investigations.

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Principles of Nano-Optics , pp. 313 - 337
Publisher: Cambridge University Press
Print publication year: 2012

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References

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