Abstract
The interaction of MIR radiation with periodic metal surfaces is studied. The TEA-CO 2 laser and optoacoustic method of measuring surface-absorbed energy are used. The main emphasis is placed on studies of the influence of resonant excited surface electromagnetic waves (SEW) on absorption, reflection and radiation of IR. The sharp peaks in absorption and spectral emissivity, corresponding to resonant SEW excitation, are observed. Resonant absorption exceeds the background one by more than two orders of magnitude. The influence of the relief depth and shape on the magnitude and angular dependence of resonance absorption is studied. It is shown that without resonant SEW excitation the absorption and the radiation of “shallow” gratings is described by Fresnel formulas. The influence of angular and frequency spectra of radiation on the magnitude and angular dependence of the resonance absorption and the radiation coefficient is studied. It is found that with an increase of the widths of the angular and frequency spectra, absorption is decreased and the widths of Wood's anomalies are increased. The fine structure of a specular reflected beam is discovered. It has been shown that the analytical theory is in a qualitative agreement with the experimental results.
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