Resonant laser printing of structural colors on high-index dielectric metasurfaces

Xiaolong Zhu*, Wei Yan, Uriel Levy, N. Asger Mortensen, Anders Kristensen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

264 Scopus citations

Abstract

Man-made structural colors, which originate from resonant interactions between visible light and manufactured nanostructures, are emerging as a solution for ink-free color printing. We show that non-iridescent structural colors can be conveniently produced by nanostructures made from high-index dielectric materials. Compared to plasmonic analogs, color surfaces with high-index dielectrics, such as germanium (Ge), have a lower reflectance, yielding a superior color contrast. Taking advantage of band-to-band absorption in Ge, we laser-postprocess Ge color metasurfaces with morphology-dependent resonances. Strong on-resonance energy absorption under pulsed laser irradiation locally elevates the lattice temperature (exceeding 1200 K) in an ultrashort time scale (1 ns). This forms the basis for resonant laser printing, where rapid melting allows for surface energy-driven morphology changes with associated modification of color appearance. Laser-printable high-index dielectric color metasurfaces are scalable to a large area and open a new paradigm for printing and decoration with nonfading and vibrant colors.

Original languageAmerican English
Article numbere1602487
JournalScience advances
Volume3
Issue number5
DOIs
StatePublished - May 2017

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