Analysis staff creates hybrid resonant metasurfaces with configurable structural colours

Hybrid resonant metasurfaces with configurable structural colors — Directed development of amorphous silicon nanocups a) Scheme depicting the fabrication technique of nanocup metasurfaces together with i) metallic deposition ii) spin coating of double layer resist iii) electron beam publicity iv) directed development of a-Si by way of sputtering v) lift-off. b) Chosen scanning electron micrographs of the a-Si nanocup arrays highlighting: open resonator construction, excessive uniformity, and nanometric character (sidewalls = 50 nm). c) Optical micrograph of an optical sample illustrating the formation of vibrant colours alongside scanning electron micrographs exhibiting the Moiré impact of the nanocup array. Because of the massive picture part, the optical micrograph (left) reveals a brightness gradient attributable to the non-uniform illumination of the pattern. Credit score: *Superior Optical Supplies* (2024). DOI: 10.1002/adom.202401501

“Shade is essential,” as pop artist Roy Lichtenstein famously stated, however the significance of coloration extends far past artwork. From the creation of Prussian blue—the primary artificial pigment—to quantum dots in fashionable show know-how, colours and their creation have at all times mirrored technological progress.

Researchers at ETH Zurich’s Laboratory for Nanometallurgy have developed a brand new fabrication technique for non-primitive metasurfaces, by which the colours of those metasurfaces signify and visualize light-matter interactions. The paper is revealed within the journal Superior Optical Supplies.

To showcase the capabilities of those metasurfaces, the researchers recreated Lichtenstein’s iconic “Sinking Solar” on the nanoscale. This copy illustrates how particular resonant states—or, in easier phrases, colours—will be engineered by cautious manipulation of geometry and supplies. Consequently, these metasurfaces are ideally suited to encoding data in ways in which stay visually imperceptible, providing a strong deterrent in opposition to counterfeiting.

Research team creates hybrid resonant metasurfaces with configurable structural colors — Producing Colours with Factors a) Roy Lichtensteins “Sinking Solar,” ( Property of Roy Lichtenstein) b) optical micrograph of nanoscale copy of the “Setting solar” with a-Si nanocup metasurface c) Optical micrograph illustrating the colour change by chemical dealloying, i.e., the formation of a disordered optical cavity and consequent coupling between the aSi nanocups and the disordered cavity. The subfigures on the backside current the colour facilities, i.e., the factors producing the picture. Credit score: *Superior Optical Supplies* (2024). DOI: 10.1002/adom.202401501

Extra data:
Jelena Wohlwend et al, Hybrid Resonant Metasurfaces with Configurable Structural Colours, Superior Optical Supplies (2024). DOI: 10.1002/adom.202401501

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Analysis staff creates hybrid resonant metasurfaces with configurable structural colours (2024, October 15)
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