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New concept for structural colors

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Figure 1: Comparison of the computed reflection spectrum of two photonic glasses. (a) consists of homogeneously filled spheres and (b) is build up from hollow sphere particles with a ceramic shell. The sphere diameter is around 200 nanometers and the thickness of the shell is around 10 nanometers.

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The right figure shows a much steeper reflection spectrum which will produce a much higher saturation of the blue color.

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Both blocks show cutouts of volumes filled with spheres which were the basis of the numerical simulations.

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(c) Chromaticity diagram: The positions of the two reflection spectra in (a) and (b) are shown in relation to the colorless white point. The diagram further shows the white point and the positions of the pure colors on the perimeter indicated by the corresponding wavelengths in nm.

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The structure from hollow sphere particles produces a blue color much closer to the perimeter, thus a much purer color, than the structure from homogeneously filled spheres.

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