Improving the homogeneity of diffraction based colours by fabricating periodic patterns with gradient spatial period using Direct Laser Interference Patterning

This study focuses on the development of a strategy to produce periodic structures with a variable spatial period for increasing the homogeneity of structural colours by means of direct laser interference patterning. Using a four-beam interference configuration, hole-like periodic arrays are produce...

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Bibliographic Details
Published inScientific reports Vol. 9; no. 1; p. 7801
Main Authors Voisiat, Bogdan, Wang, Wei, Holzhey, Max, Lasagni, Andrés Fabián
Format Journal Article
LanguageEnglish
Published London Nature Publishing Group UK 24.05.2019
Nature Publishing Group
Nature Portfolio
Subjects
639/301/930/2735
639/301/930/543
639/624/1075/1080
Color
Confocal microscopy
Diffraction
Homogeneity
Humanities and Social Sciences
Lasers
multidisciplinary
Science
Science (multidisciplinary)
Spectroscopy
Spectrum analysis
Stainless steel
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Summary:This study focuses on the development of a strategy to produce periodic structures with a variable spatial period for increasing the homogeneity of structural colours by means of direct laser interference patterning. Using a four-beam interference configuration, hole-like periodic arrays are produced on stainless steel with a 70 ps pulsed laser source operating at 532 nm laser wavelength. The laser processing parameters are optimised for obtaining patterns with the highest possible diffraction efficiency and thus showing the highest possible colour intensity. A model for calculating the required spatial period to obtain a defined colour under specific conditions of illumination and observation angles is presented. A very good agreement between the captured structural colour spectrum and the real visible spectrum of light was obtained. In addition, a strategy for mixing holographic colours, in particular for obtaining the white colour is developed. Finally, the developed model is successfully integrated into machine software, in order to automatically process images that exhibit required colours at certain viewing conditions. The produced patterns are characterised using confocal microscopy and the efficiency of the first diffraction order was measured by optical spectroscopy.
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ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-019-44212-4