A new nano-structured optical hetero-coating, i.e., combination of absorptive Ge and transparent conductive oxide Ga-doped zinc oxide (GZO) film has been developed for ultraviolet (UV) protection. GZO (3% Ga) film spin-coated by metal organic deposition (MOD) acts as a UV light absorber because of its large band gap, while Ge film deposited by electron-beam evaporation is used as visible light absorber. Modulating the nanometer-level Ge thickness causes the prominent variations of transmittance and reflectivity, therefore coloring Ge/GZO system, ascribed to strong interference effect and therefore absorption resonance.