![]() ![]() This leads to a decrease in reflectivity, which depends on the metal's characteristics. ![]() However, in higher frequencies, deviations of Drude`s approach start to appear, because bound electrons of the metal start to respond to the incidence of light, instead of just valence band electrons response. It was observed that, at higher wavelengths (lower frequencies), the optical constants of metals are similar to the values of Drude`s function, where the complex refractive index is much smaller then the damping constant, or extinction coefficient. This conclusion was derived by Drude and confirmed experimentally by Hagens-Ruben. demonstrated in the figure, total internal reflection is only possible when n 1 > n 2., and occurs at the critical angle C sin-1(n 2 /n 1). ![]()
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