A translucent or transparent film or sheet comprises a substrate (1) covered with a layer of a dielectric high refractive index material (4) containing a thin metallic layer (3) embedded in material, and a further layer (5) of translucent or transparent material covering layer of a dielectric high refractive index material (4), the embedded metal layer (3) is periodically interrupted with a periodicity of 50 to 800nm such that metal covers at least 70% of the substrate area. Also provided a window, glas façade element or solar panel comprising the film or sheet, a method for manufacturing the film or sheet, and a method for reducing the transmission of solar IR radiation using the the film or sheet.