Abstract
The colourisation of metallic surface which appears due to periodic surface patterns induced by ultrashort laser pulses is studied. Ripples due to the sub-micrometer size of their period act as a diffraction grating, generating structural colours. Carefully chosen strategy of the laser spot scanning allows us to mimic the nanostructures responsible for structural colours of some flowers on the metal substrate. We investigate the correlation between the colourising effects and the artificially-induced defects in the ripples structure and show that these defects can make the colours observable in a larger range of viewing angles. Further we address the influence of the processing parameters on the spectral profile of the reflected light.
Highlights
The colourisation of metallic surface which appears due to periodic surface patterns induced by ultrashort laser pulses is studied
The optical properties of the laser-induced periodic structures (LIPSS) covering the samples are analysed in a set-up shown in Fig. 2, which enables observation of the structural colours revealed after illuminating the surface with white light
On the contrary, when only a part of the surface is covered with LIPSS the structural colours are observed over a wider range of viewing angles, while at each angle almost the whole spectrum in the visible regime is diffracted revealing a colourful surface
Summary
The colourisation of metallic surface which appears due to periodic surface patterns induced by ultrashort laser pulses is studied. In this paper we will show that a nearly ideal periodic LIPSS pattern is not optimal for structural colours and defects on the surface can facilitate the observation of vivid colours at a larger range of viewing angles.
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