Abstract

It has gone unnoticed for many years that in the usual high-plasma-frequency (ωp) limit p2ωp2/ω20(1 + g2) ≡ G, the usual Drude results reduce to simple expressions for the metallic absorptance {A = (81/2/p)[(1 + g2)1/2 − 1]1/2 ≡ (81/2/p)An}, the inverse relation {g ≡ 1/ωτ = [(1 + An2)2 − 1]1/2}, and the temperature derivative [dAn/dT = g(dg/dT)/2(1 + g2)1/2An], where ω is the photon frequency and τ is the electron-momentum relaxation time. The single normalized curve An(g) gives the absorptance of any metal (in the limit p2G).

© 1981 Optical Society of America

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