FIELD: physics.
SUBSTANCE: invention relates to a thin-film element (30) having an interference layer structure for security papers, value documents and the like, having at least two semitransparent absorber layers (34, 38) and at least one dielectric spacing layer (36) arranged between the at least two absorber layers. According to the present invention, each of the two absorber layers (34, 38) consists of material having a complex refraction index N whose real part n and imaginary part k differ at least in a portion of the visible spectral range by a factor of 5 or more.
EFFECT: improved protection.
23 cl, 8 dwg
