Abstract: The prerequisite and mode of electromagnetic response of nano metal/dielectric filmsto electromagnetic wave field were suggested. With the carrier density and the re-flectance, transmittance of the film, the plasma frequency and the dependence of ab-sorptance on the frequency of electromagnetic wave field were calculated respectively.The calculated results accorded with the experimental ones, which proved the plasmaresonance is one mode of electromagnetic response.

Key words: nano aluminum film, electromagnetic response