It is shown that metal films will absorb more infrared radiation if they are made thinner. For most metals, the maximum absorptance is obtained for films which are less than 100 Å in thickness. Experiments are reported here for Pt on Si, for which peak absorptance of 3.39-μm radiation incident through the Si is found to be 0.5±0.1 for a film 80 Å thick.
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Mahan et al. (1983) studied this question.
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