Bright colors produced by laser heating

phys.org | 1/15/2019 | Staff
vegdancer18 (Posted by) Level 3
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Most of the colors on today's paper and fabric are made using dyes or pigments. But colors can also be produced by modifying a material's surface at the nanoscale, causing the surface to reflect or scatter different frequencies of light and giving these materials "structural color." Butterfly wings and bird feathers are examples of materials that naturally exhibit structural color.

In a new study published in ACS Nano, a team of researchers led by Sergey Bozhevolnyi at the University of Southern Denmark has developed a new method for producing bright structural colors on metal films called near-percolation plasmonic reflector arrays. The method uses lasers to heat and reshape tiny (4-nm) gold nanoislands on a silica surface, potentially offering a simple and inexpensive alternative to lithographic nanopatterning.

Order - Colors - Laser - Power - MW

In order to produce different colors, the laser power is adjusted from 1 to 10 mW. The laser power corresponds to different amounts of heating, which reshapes the gold nanoislands in such a way that they reflect light of different colors. Yellow is produced at low powers, green at intermediate powers, and red at high powers.

The method also produces different results depending on the laser's polarization (light waves are polarized when...
(Excerpt) Read more at: phys.org
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