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These paintings show the future of optoelectronics

10 October 2023
Starry Night by Vincent van Gogh, and Girl with the pear earring by Johannes Vermeer | Wikimedia

Scientists at the Zernike Institute for Advanced Materials, University of Groningen, have just reproduced two famous paintings at the micrometre scale. This wasn’t just a homage to Dutch masters Johannes Vermeer and Vincent van Gogh, but a proof of principle in manufacturing minute optical systems.

FSE Science Newsroom | René Fransen

The canvas for these reproductions was formed by a layer of reflecting gold. On top of that, scientists led by professor of Nanostructured Materials and Interfaces Bart Kooi deposited a thin film of Sb2Se3 (antimony-selenium). Light-reflecting off the gold and passing through the film then takes on different colours, depending on the thickness of the film – just like a drop of oil on water will produce colourful reflections.

Images of Girl with a Pear Earring, in greyscale and true colours created by hight-differences in a thin film
The painting ‘Girl with a Pearl Earring’ by Johannes Vermeer was first transformed into a grey scale image, which was then reproduced on a micrometre scale by a novel ion milling approach, creating nanometer-scale height differences. The left panel shows a scanning electron microscopy (SEM) image. The middle panel shows true structural colours due to height variations created in the amorphous top film. The right image shows true colours after the film was crystallized. | Images Bart Kooi lab, University of Groningen

Lithography

The pictures were first transformed into a greyscale image. An ion beam was then calibrated to mill the thin film to a depth that corresponded to the greyscale with nanometre precision. Light that is reflected through the thin film takes on a colour that depends on the local thickness of that film, resulting in a real colour image of the ‘Girl with a Pearl Earring’ by Vermeer (and also van Gogh’s Starry Night, not shown here).

This miniature art was created as a proof of principle, to show that ion beam milling can create nanometre-scale pixels with continuous height differences, something that isn’t possible when using traditional techniques like lithography. As the Sb2Se3 thin film is a phase-change material, it is also possible to change the properties of the pixels by switching their structure using electric pulses.

These tiny pixels could perhaps one day be used in displays, but will more likely be applied to create optical chips and other applications in optoelectronics.

The research was published in the journal Advanced Materials on 1 September.

Last modified:09 November 2023 4.02 p.m.
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