الفهرس 
SURFACE EM MODES AT THE INTERFACF: OF TWO SEMI-INFINITE MELIA
Tsotrooic dielectric mediaOnly 14 pages are availabe for public view
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Abstract
SLJ~:nAF:Y
Surface electromagnetic waves are electromagnetic
r:.odes that propagate along the interface between two :nedia
a:12< wi,•: sE: propat;ation constants depend on the dielectric
and ma~netic properties of the two media.
In this study, we have discussed (i) the nature of
the modes which exist at a single-interface between two
’’edia, (ii) the nature of the modes which exist at thEe two
interfaces between three media, (iii) the attenuated total
rLflection (ATR) method for coupling volume electron:agnetic
waves and surface electromagnetic waves by prisms.
~e have carried out experimental studies of surface
electromagnetic waves on clean Ag filrc:s. T~1e ATR technique
v.as employed to study the resonant excitation of surface
electromagnetic waves on the Ag films by transverse
::;agneti c ( T:.:) polarizeo beams fron: He-Ne C\’ . laser ar;c
Argon-Ion C’’ laser using different wavelengths ranging
Irom 45?9 A• to 6328 A• The thicknesses of the Ag filn:c1
varied between 200 A• to 1000 A•
The ATR spectrum, when the T~ light couples reso!Iantly
with surface electromagnetic waves, stwws a minimum at an
angle ( 8ATR ) Frorr the angle eATR and the half width
c r the minimum ( ~ eATR ) , the real and the imaginary
:arts of the dielectric constant of the Ag films were uc~cr~in~o for each film thickness. Th~ vaJ ues ottc.inec
. r the complex dielectric constant converge to a limiting
value close to the published bulk value. Furthermore,
!rum the ATH spectrum, we were able to plot the oispersion
relation for the surface electromagnetic waves in the three
Jayer configuration (prism/metal/air) for three different
tr:icknesses of the Ag film. The three media dispersion
relation shows a tendency to approach the dispersion
relation, for the surface electromagnetic waves aloni the
ir:tcrface of two semi-infinite mecii& (metaJ/air) i.e.
unuerturbed two media case.
A discussion of the employment of surface electror:,
agnetic waves as spectroscopic tool for investigatinG
P:ctal surfaces as well as add-layers on metal surfacee
.~ j Ke oxioes, are also included.