Can Silicon Nanostructures Knock Plastic Lenses Out of Cell Phone Cameras?

Startup Metalenz says its nanostructures do a better job of guiding light to image sensors than curved plastic lenses

2 min read
Metalenz's lens on a chip
Metalenz's nanostructures, built using standard semiconductor processes, can replace the lenses in cell phone camera modules
Photo: Metalenz

It’s been a good decade or so for the makers of plastic lenses. In recent years, smartphone manufactures have been adding camera modules, going from one to two to five or more. And each of those camera modules contains several plastic lenses. Over the years, these lenses have changed little, though image processing software has improved a lot, merging images from multiple camera modules into one high quality picture and enabling selective focus and other features.

The glory days of the plastic camera lens, however, may be drawing to a close. At least that’s the hope of Metalenz, a Boston-area startup that officially took its wraps off today.

The company aims to replace plastic lenses with waveguides built out of silicon nanostructures using traditional semiconductor processing techniques. Metalenz’s technology grew out of work done at Harvard’s John A. Paulson School of Engineering and Applied Sciences. Harvard is not the only university laboratory that has investigated metastructures for use as optical wave guides— Columbia, the University of Michigan, and King Abdulla University of Science and Technology in Saudi Arabia are among the institutions with teams researching the technology. However, Harvard’s team, led by applied physics professor Federico Capasso, was the first group to be able to focus the full spectrum of visible light using a metalens.

Capasso cofounded Metalenz in 2017 with Robert Devlin, who worked on the Harvard project as part of his Ph.D. research. The company has an exclusive license to Harvard’s patents related to metalenses.

Devlin says that a metalens has several advantages.

“Producing a lens via semiconductor processes reduces the complexity of what is now a multistep process to build a camera module. And it could lead to much smaller modules, with the lens attaching directly to the surface of the sensor, instead of using more complex packaging methods,” he says.

Also, Devlin pointed out, “with a variety of these structures on the same chip, one metalens can act like multiple plastic lenses, allowing the image processing software to combine images to improve image quality in the same way it combines images from separate camera modules today.”

Metalenz has raised $10 million to scale up production of its devices, with investors including 3M Ventures, Applied Ventures, Intel Capital, M Ventures, and TDK Ventures. The company expects to ship its first chips in early 2022. These will be for use in 3D imaging.

“3D cameras are even more complex than traditional cameras,” says Devlin. “They have multiple lenses, sometimes made by different suppliers, and a laser that illuminates the scene. We bring less complexity, and, because we can get more light to the sensor, the laser doesn’t have to be as bright or shine as long, so we can increase battery life.”

For now, Metalenz is aiming to replace the existing camera modules in cell phones, But Devlin anticipates that in the future, the technology will allow new imaging tools to move into mobile devices.

“We can combine different types of optics in a single layer, so things that now are too big and bulky to leave a lab or medical facility because they contain many large lenses—like a spectrometer—can shrink down to a size and price point that will allow them to fit in anybody’s pocket.”

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3D-Stacked CMOS Takes Moore’s Law to New Heights

When transistors can’t get any smaller, the only direction is up

10 min read
An image of stacked squares with yellow flat bars through them.
Emily Cooper
Green

Perhaps the most far-reaching technological achievement over the last 50 years has been the steady march toward ever smaller transistors, fitting them more tightly together, and reducing their power consumption. And yet, ever since the two of us started our careers at Intel more than 20 years ago, we’ve been hearing the alarms that the descent into the infinitesimal was about to end. Yet year after year, brilliant new innovations continue to propel the semiconductor industry further.

Along this journey, we engineers had to change the transistor’s architecture as we continued to scale down area and power consumption while boosting performance. The “planar” transistor designs that took us through the last half of the 20th century gave way to 3D fin-shaped devices by the first half of the 2010s. Now, these too have an end date in sight, with a new gate-all-around (GAA) structure rolling into production soon. But we have to look even further ahead because our ability to scale down even this new transistor architecture, which we call RibbonFET, has its limits.

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