An entirely new type of coupled surface electromagnetic mode has been observed, the existence of which depends upon a large imaginary component of the dielectric constant of a thin layer. It is a long-range mode, giving a very sharp reflectivity dip for transverse magnetic polarized radiation coupled to it using the attenuated-total-reflection technique. Because its existence relies on the presence of a highly absorbing layer it may open up new avenues for nonlinear optics experiments.
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Yang et al. (1990) studied this question.
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