This volume is based on lectures and contributed papers presented at the
Eighth Course of the International School of Materials Science and Tech-
nology that was held in Erice, Sicily, Italy at the Ettore Majorana
Centre for Scientific Culture during the period 1-13 July 1985. The
subject of the course was "Electromagnetic Surface Excitations". Forty
lectures were given by eleven distinguished scientists and engineers
from France, Italy, the United Kingdom, and the United States. In
addition to the lectur- ers, approximately fifty participants
representing eleven different countries throughout the world t. ook part
in the course. Short contributed papers were presented by seventeen
participants on the results of their own re- search. The subject of the
Course is of great importance for both pure science and for practical
applications such as telecommunications. A technolog- ical revolution is
occurring in which the transmission of information by means of
electrical currents travelling in copper wires is being replaced by
transmission by means of light travelling in objects known as optical
wave guides. The manipulation and processing of the light signals prior
and subsequent to transmission through the wave guide has resulted in a
technology often referred to as integrated optics. Important to the
opera- tion of integrated optics devices is the behavior of
electromagnetic waves near surfaces and interfaces. One of the goals of
the course was to further the dialogue between engineers and physicists
in common areas of interest related to the propagation of
electromagnetic waves along surfaces.