A Better 3D Camera with Clear, Graphene Light Detectors
March 11, 2016 | University of MichiganEstimated reading time: 2 minutes

A camera that can record 3D images and video is under development at the University of Michigan, with $1.2 million in funding from the W.M. Keck Foundation.
While other 3D cameras are currently on the market, the new design should be smaller and able to achieve higher resolutions.
3D cameras are useful for a variety of applications including 3D movie filming and, eventually, virtual reality. While 3D films are currently made using multiple cameras to reconstruct each frame, this new type of camera could record in 3D on its own. Images and video recorded by 3D cameras might one day be projected as holograms—although projection is a different challenge entirely.
In photography, 3D images enable users to decide the depth of focus after taking the photograph. Attached to microscopes, a 3D camera can image cells and tissues for more accurate analysis of biopsies and medical cultures, as well as for fundamental research. 3D video recording could give robots depth perception and eventually lead to a bionic eye.
"When the light hits the detector inside a camera, it can come from different directions, and this spatial information can be used to reconstruct 3D images," said Zhaohui Zhong, an associate professor of electrical engineering and computer science.
"Normally, that information is lost because the detector only measures intensity," he added, which is why 3D images made with traditional recording methods must be constructed from multiple shots.
One-shot 3D cameras available now rely on a micro-lens array to divert the light after it has been focused by the main lens. This array of smaller lenses essentially tears up the picture to recover the directional information from the rays of light, and then the camera's software reconstructs the image along with the depth information.
The design—to be developed by Zhong and colleagues Theodore Norris and Jeffrey Fessler, both professors of electrical engineering and computer science—does away with the micro-lens array. Instead, their camera will record the light as it passes through a series of transparent light detectors.
"The microlens approach involves an inherent trade-off between resolution and the ability to refocus or resolve depth," Norris said. "Our stack approach enables more information to be acquired without losing image resolution."
This method works because objects at different distances from the lens will come into focus at different points inside the camera, the researchers say. Objects will appear brightest where they are most in focus. Using this principle, it is much easier for the computer to reconstruct the images. The faster processing makes it possible to produce high speed and high-resolution video.
The concept is simple, but the challenge is making those transparent light detectors, they say. Typically, the detector needs to absorb as much light as possible to give the most detailed image. However, a material called graphene, which is a single layer of carbon atoms, can be fashioned into a highly sensitive light detector that allows much of the light to pass through.
"Ordinarily, you want the light detector to absorb as much light as possible for high sensitivity, to produce a clearer picture," Zhong said. "Graphene detectors can offer very high sensitivity, so you don't really sacrifice the clarity by making them transparent."
The team is considering an SLR-sized camera to begin with, but Norris thinks it may be possible to squeeze 3D-camera capability into a smartphone.
Norris is also a professor of applied physics. Fessler is also a professor of applied physics, biomedical engineering and radiology.
Suggested Items
Hon Hai Research Institute Partners with Taiwan Academic Research Institute and KAUST to Participate in CLEO 2025
05/30/2025 | FoxconnThe research team of the Semiconductor Division of Hon Hai Research Institute, together with the research teams of National Taiwan University and King Abdullah University of Science and Technology in Saudi Arabia, has successfully made breakthroughs in multi-wavelength μ -LED technology to achieve high-speed visible light communication and optical interconnection between chips.
ICEFlight to Accelerate Maturation of Cryogenic Technologies for Hydrogen-Powered Flight
05/27/2025 | GKN AerospaceGKN Aerospace is one of the project partners in ICEFlight (Innovative Cryogenic Electric Flight), a project aiming to contribute to the development of hydrogen-powered flight.
Vertical Aerospace Makes Aviation History with Piloted eVTOL Flight in Open Airspace
05/27/2025 | BUSINESS WIREVertical Aerospace, a global aerospace and technology company that is pioneering electric aviation, announced it has made European aviation history with the first-ever piloted wingborne flight of a winged electric vertical take-off and landing (eVTOL) aircraft in open airspace.
Dymax to Showcase Light-Cure Solutions at The European Battery Show 2025
05/23/2025 | Dymax CorporationDymax, a global manufacturer of rapid light-curing materials and equipment, will exhibit at The European Battery Show 2025 in Stand 4-C60
Northrop Grumman Navigation Technology Completes Hypersonic Test Flights
05/14/2025 | Northrop GrummanNorthrop Grumman Corporation successfully completed two test flights of its Advanced Hypersonic Technology Inertial Measurement Unit at hypersonic speed, leveraging Stratolaunch’s reusable hypersonic airplane, Talon-A.