As a rule surface polaritons of dielectric or semiconductor crystals and surface plasmon - po- laritons of metals are considered as nonradiative excitations because their wave vectors q are largethan wave vector of light in a vacuum lc() [1]. The existence of radiative surface polaritons andthe possibility of their experimental detection by the spectra of thermal radiation of samples wasinvestigated in [1-3].„ • , , , , , ,. ,. , • ,. .
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