Abstract
Several characteristic features of electromagnetic (EM) surface waves propagating between a pair of planar conductors are disclosed analytically along with the other normal EM modes. The solutions are obtained on the basis of electron plasma oscillation in metals. The results are summarized as follows: (I) there exist primarily two independent surface waves (or optical surface waves), even and odd surface modes; (II) the odd surface mode (SWo) becomes a pure transverse electromagnetic (TEM) wave in the limiting case of an infinite value of electron density in metals; and (III) the even surface mode (SWe) will smoothly change to the even TM1e mode at a certain point of the dispersion curve. Utilizability of the lower modes is discussed for very-high-frequency RF and optical wave transmission lines and for long or large-area plasma production between planar electrodes.
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