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Flat camera lens is 1,000x thinner than standard lens on smartphone

The new wave of smartphones to hit the market all come with incredible cameras that produce brilliant photos. There's only one complaint: The thick camera lenses on the back that jet out like ugly bumps on a sheet of glass.

But new research appears to solve that problem.

University of Utah electrical and computer engineering researchers have developed a new kind of optical lens that is much, much thinner and lighter than conventional camera lenses, and it also works with night imaging. The feat is a boon for smartphones of the future, because it could flatten those unsightly "camera bumps," and also for drones and night-vision cameras for soldiers.

The team's work is profiled in a new research paper profiled in the latest edition of Proceedings of the National Academy of Sciences. The paper is co-authored by Univ. of Utah electrical and computer engineering graduate students Monjurul Meem, Sourangsu Banerji, Apratim Majumder, U electrical and computer engineering associate professors Rajesh Menon and Berardi Sensale Rodriguez, and U mathematics associate professor Fernando Guevara Vasquez. A copy of the paper can be viewed here.

A flat lens developed by researchers at the Univ. of Utah is much thinner and lighter than a conventional lens and could produce lighter cameras. [Credit: Dan Hixson/University of Utah College of Engineering]

 

 

 

 

While conventional lenses for smartphone cameras are a couple of millimeters thick, the new lens is only a few microns thick, or a thousand times thinner than regular lenses, according to Menon.

"Our lens is a hundred times lighter and a thousand times thinner, but the performance can be as good as conventional lenses," he says.

A conventional curved lens takes light that bounces off an object and bends it before it ultimately reaches the camera sensor that forms the digital picture. But this new lens has many microstructures, each bending the light in the correct direction at the sensor. The team has developed a fabrication process with a new type of polymer along with algorithms that can calculate the geometry of these microstructures.

"You can think of these microstructures as very small pixels of a lens," Menon explains. "They're not a lens by themselves but all working together to act as a lens."

The result is a lens that is flat instead of curved and more than 20 times thinner than a human hair, with the added capability of being used in thermal imaging to see objects in the dark.

While this could ultimately produce smartphone cameras with no bump, it could also give them the ability to take thermal imaging to look for heat signatures. But a more immediate use for this technology would allow lighter military drones to fly longer for night missions or to map forest fires or look for victims of natural disasters. And soldiers in the field could carry much lighter night-vision cameras for longer durations.

Menon says this new lens could also be cheaper to manufacture, because the design allows them to create them out of plastic instead of glass.

The research was funded by the National Science Foundation and the U.S. Office of Naval Research.

Source: University of Utah

Published October 2019

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