Researchers develop tiny camera the size of a grain of salt - and it could turn your phone into one big camera

The tiny lenses are far greater than those previously developed and could be used with medical robots for invasive surgery

Adam Smith
Thursday 09 December 2021 17:02
Comments
Leer en Español

Researchers have created an ultracompact camera the size of a grain of salt capable of producing pictures on par with lenses hundreds of thousands of times larger than it.

Engineers from Princeton University and the University of Washington say that the camera can produce full-colour images that could be used in collaboration with medical robots to diagnose and treat diseases.

Traditional cameras use curved glass or plastic to bend light rays, this new camera uses ‘metasurface’ technology which is produced like a computer chip. The metasurface of this particular camera has 1.6 million cylindrical posts – each approximately the size of a virus – to make up a system just half a millimetre wide.

Each of those posts has its own unique geometry, working like an optical antenna, and machine-learning algorithms can use the posts’ combined interactions with light to create high-quality images. Compared to older versions of these cameras, this camera works better in natural light conditions, has fewer distortions, and larger fields of view too.

Previous micro-sized cameras (left) captured fuzzy, distorted images with limited fields of view. A new system called neural nano-optics (right) can produce crisp, full-colour images on par with a conventional compound camera lens.

“It’s been a challenge to design and configure these little nano-structures to do what you want,” said Ethan Tseng, a computer science PhD student at Princeton who co-led the study.

“For this specific task of capturing large field of view RGB images, it was previously unclear how to co-design the millions of nano-structures together with post-processing algorithms.”

The next step for the researchers will be to add greater computational abilities to the camera – such as object detection and other modalities that would make it more useful in medicine or robotics.

Felix Heide, the study’s senior author and an assistant professor of computer science at Princeton, predicts that ultracompact imagers will be used to create “surfaces as sensors.”

Individual surfaces could be turned into cameras with ultra-high resolution, “so you wouldn’t need three cameras on the back of your phone anymore, but the whole back of your phone would become one giant camera. We can think of completely different ways to build devices in the future,” he said.

Register for free to continue reading

Registration is a free and easy way to support our truly independent journalism

By registering, you will also enjoy limited access to Premium articles, exclusive newsletters, commenting, and virtual events with our leading journalists

Already have an account? sign in

By clicking ‘Register’ you confirm that your data has been entered correctly and you have read and agree to our Terms of use, Cookie policy and Privacy notice.

This site is protected by reCAPTCHA and the Google Privacy policy and Terms of service apply.

Join our new commenting forum

Join thought-provoking conversations, follow other Independent readers and see their replies

Comments

Thank you for registering

Please refresh the page or navigate to another page on the site to be automatically logged inPlease refresh your browser to be logged in