Photonic glass for high contrast structural color

Scientific Reports
Guoliang ShangManfred Eich

Abstract

Non-iridescent structural colors based on disordered arrangement of monodisperse spherical particles, also called photonic glass, show low color saturation due to gradual transition in the reflectivity spectrum. No significant improvement is usually expected from particles optimization, as Mie resonances are broad for small dielectric particles with moderate refractive index. Moreover, the short range order of a photonic glass alone is also insufficient to cause sharp spectral features. We show here, that the combination of a well-chosen particle geometry with the short range order of a photonic glass has strong synergetic effects. Using a first-order approximation and an Ewald sphere construction the reflectivity of such structures can be related to the Fourier transform of the permittivity distribution. The Fourier transform required for a highly saturated color can be achieved by tailoring the substructure of the motif. We show that this can be obtained by choosing core-shell particles with a non-monotonous refractive index distribution from the center of the particle through the shell and into the background material. The first-order theoretical predictions are confirmed by numerical simulations.

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Citations

Sep 10, 2020·Proceedings of the National Academy of Sciences of the United States of America·Gianni JacucciLukas Schertel
Apr 1, 2020·Optics Express·Guoliang ShangManfred Eich
Aug 8, 2019·Scientific Reports·Guoliang ShangManfred Eich
Mar 27, 2021·Journal of Colloid and Interface Science·Guy WiernikSandeep Verma
Oct 2, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Yui NaoiYukikazu Takeoka
Jan 4, 2020·ACS Applied Materials & Interfaces·Kyungnae BaekJerome K Hyun

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Methods Mentioned

BETA
light scattering

Software Mentioned

MUSEN
CST Microwave Studio

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