Researchers at China’s University of Science and Technology have developed a revolutionary new contact lens that can convert infrared light into visible light, allowing humans to see in the dark for the first time. The lenses, called upconversion contact lenses (UCLs), use tiny particles made of gold, sodium gadolinium fluoride, ytterbium, and erbium ions to amplify long infrared wavelengths and convert them into visible colors.
The UCLs work by enriching the infrared light with energy, which makes it visible to the human eye. However, the images produced are often blurred due to the scattering of light by the nanoparticles. The researchers were able to partially compensate for this effect by adding additional lenses.
In tests, humans were able to recognize patterns, letters, and flashing infrared signals in the dark, even with their eyes closed. This is because infrared light can easily penetrate the eyelids, allowing image generation to proceed without interference from normal visible light.
The technology is inspired by animal species that can perceive infrared light, such as snakes and certain fish. These animals do not see infrared light as “light” in the same way humans do, but rather as heat radiation emitted by objects.
The benefits of the UCLs are still unclear, with potential uses including surgical procedures, encryption, and counterfeit protection. However, many critics argue that night vision devices are more effective and easier to use.
The development of the infrared contact lenses marks a significant breakthrough in the field of optoelectronics and has the potential to revolutionize various industries and applications.
Source: https://www.dw.com/en/infrared-contact-lens-enables-humans-to-see-in-dark/a-72749143