Dieses Dokument steht unter einer CreativeCommons Lizenz by/4.0
Verlagslink DOI: 10.1038/s41598-018-26119-8
Titel: Photonic glass for high contrast structural color
Sprache: English
Autor/Autorin: Shang, Guoliang 
Maiwald, Lukas 
Renner, Hagen 
Jalas, Dirk 
Dosta, Maksym 
Heinrich, Stefan 
Petrov, Alexander 
Eich, Manfred 
Schlagwörter: applied optics;nanoparticles
Erscheinungsdatum: 17-Mai-2018
Verlag: Macmillan Publishers Limited
Quellenangabe: Scientific Reports 1 (8): (2018)
Zeitschrift oder Schriftenreihe: Scientific reports 
Zusammenfassung (englisch): 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.
URI: http://tubdok.tub.tuhh.de/handle/11420/1668
DOI: 10.15480/882.1665
ISSN: 2045-2322
Institut: Optische und Elektronische Materialien E-12 
Feststoffverfahrenstechnik und Partikeltechnologie V-3 
Dokumenttyp: (wissenschaftlicher) Artikel
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