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Publisher DOI: 10.1038/s41598-018-26119-8
Title: Photonic glass for high contrast structural color
Language: English
Authors: Shang, Guoliang 
Maiwald, Lukas 
Renner, Hagen 
Jalas, Dirk 
Dosta, Maksym 
Heinrich, Stefan 
Petrov, Alexander  
Eich, Manfred 
Keywords: applied optics;nanoparticles
Issue Date: 17-May-2018
Publisher: Macmillan Publishers Limited
Source: Scientific Reports 1 (8): (2018)
Journal or Series Name: Scientific reports 
Abstract (english): 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.
DOI: 10.15480/882.1665
ISSN: 2045-2322
Institute: Optische und Elektronische Materialien E-12 
Feststoffverfahrenstechnik und Partikeltechnologie V-3 
Mehrskalensimulation von Feststoffsystemen V-EXK1 
Type: (wissenschaftlicher) Artikel
Project: Open Access Publizieren 2018 - 2019 / TU Hamburg 
SFB 986: Teilprojekt A3 - Herstellung höherer hierarchischer Ebenen von Materialsystemen mit der Wirbelschicht-granulation und Diskrete-Elemente-Modellierung der Materialien 
SFB 986: Teilprojekt C2 - Keramikbasierte hochtemperaturstabile Wärmestrahlungsreflektoren und Strukturfarben 
License: In Copyright In Copyright
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