An insect-inspired camera has captured a wide field of view with no distortion, according to a new study.
To create the innovative camera, which also allows for a practically infinite depth of field, scientists at University of Colorado Boulder used stretchable electronics and a pliable sheet of microlenses made from a material similar to that used for contact lenses.
Conventional wide-angle lenses, such as fisheyes, distort the images they capture at the periphery, a consequence of the mismatch of light passing through a hemispherically curved surface of the lens which is then captured by the flat surface of the electronic detector.
For the digital camera described in the new study, published yesterday in the journal Nature, the researchers were able to create an electronic detector that can be curved into the same hemispherical shape as the lens, eliminating the distortion.
"The most important and most revolutionising part of this camera is to bend electronics onto a curved surface," says Jianliang Xiao, assistant professor of mechanical engineering at Boulder and co-lead author of the study.
"Electronics are all made of silicon, mostly, and silicon is very brittle, so you can't deform the silicon. Here, by using stretchable electronics we can deform the system; we can put it onto a curved surface."
Creating a camera inspired by the compound eyes of arthropods — animals with exoskeletons and jointed legs, including all insects as well as scorpions, spiders, lobsters and centipedes, among other creatures — has been a long sought-after goal.
Compound eyes typically have a lower resolution than the eyes of mammals, but they give arthropods a much larger field of view than mammalian eyes as well as high sensitivity to motion and an infinite depth of field.
Compound eyes consist of a collection of smaller eyes called ommatidia, and each small eye is made up of an independent corneal lens as well as a crystalline cone, which captures the light traveling through the lens.
The number of ommatidia determines the resolution and varies widely among arthropods. Dragonflies, for example, have about 28,000 tiny eyes while worker ants have only about 100.
Imitating the corneal lens-crystalline cone pairings, the camera created by Xiao and his colleagues has 180 miniature lenses, each of which is backed with its own small electronic detector.
The electronics and the lenses are both flat when fabricated allowing the product to be manufactured using conventional systems, says Xiao, who began working on the project as a postdoctoral researcher in John Roger's lab at the University of Illinois at Urbana-Champaign.
"This is the key to our technology," Xiao says. "We can fabricate an electronic system that is compatible with current technology. Then we can scale it up."
The lens sheet and the electronics sheet are integrated together while flat and then molded into a hemispherical shape afterward. Each individual electronic detector and each individual lens do not deform, but the spaces between the detectors and lenses can stretch and allow for the creation of a new 3-D shape.
The electronic detectors are all attached with serpentine filament bridges, which are not compromised as the material stretches and bends.
In the pictures taken by the new camera, each lens-detector pairing contributes a single pixel to the image. Moving the electronic detectors directly behind the lenses — instead of having just one detector sitting farther behind a single lens, as in conventional cameras — creates a very short focal length, which allows for the near-infinite depth of field.
The new paper demonstrates that stretchable electronics can be used as the foundation for a distortion-free hemispherical camera, but commercial production of such a camera may still be years away, Xiao says.