| 摘要 |
An embodiment of a solid optical sky-sun diffuser, which comprises a transparent solid matrix embedding a dispersion of transparent nanoparticles having an average size d in the range 10 nm@d@240 nm; wherein: the ratio between the blue and red scattering optical densities gamma=Log [T(450 nm)]/Log [T(630 nm)] of said diffuser falls in the range 5>=gamma>=2.5, where T(lambda) is the Monochromatic Normalized Collinear Transmittance; in at least one propagation direction, said Monochromatic Normalized Collinear Transmittance is T(450 nm)>=0.4; in at least one propagation direction said Monochromatic Normalized Collinear Transmittance is T(450 nm)@0.9, said propagation direction being the same or different from that at which said Monochromatic Normalized Collinear Transmittance is T(450 mm)>=0.4.
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