Ultra-thin display technology shows dozens of hidden images in a single screen

From smartphones and credit card televisions, technologies that handle light are deeply rooted in our daily life, many of which are based on holography. However, conventional holographic technologies have faced limits, in particular by displaying several images on a single screen and maintaining the high -resolution image quality.

Recently, a research team led by Professor Junsuk RHO at Postch (Pohang University of Science and Technology) has developed revolutionary metasurface technology that can display up to 36 High resolution images on a dietary surface than human hair. This research was published In Advanced science.

This achievement is motivated by a special nanostructure known as metasurface. Hundreds of times thinner than human hair, the metasurface is capable of precisely manipulating light when it passes. The team made pillars on a nanometric scale using silicon nitride, a material known for its robustness and its excellent optical transparency. These pillars, called meta-atoms, allow fine control of light on the metasurface.

One remarkable aspect of this technology is its ability to project entirely different images depending on the wavelength (color) and the spin (polarization direction) of light. For example, a red polarized light on the left can reveal an image of an apple, while a red light polarized in circular can produce an image of a car.

By using this technique, the researchers successfully coded 36 images 20 nm intervals in the visible spectrumAnd 8 images extending from the visible to the nearby infrared region, all on a single metasurface.

What makes this innovation particularly notable is not only its simplified design and manufacturing process, but also its improved image quality. The team addressed the previous numbers of the image diaphony and background noise by incorporating a noise deletion algorithm, resulting in lighter images with a minimum interference between the channels.

“This is the first demonstration of information on the spin and the multiplexing wavelength thanks to a unique optimization process while reaching low noise and loyalty to the high image,” said Professor RHO.

“Given its scalability and commercial viabilityThis technology has great potential for a wide range of optical applications, including a large capacity Optical data storageSectimations Systems and Multi-Image Display Technologies. “”