The researchers developed a new solid -state printing system that produces high -quality wide -angle images using metals – flat nanopattern plates that are used to reflect light. By eliminating the large and heavy lenses that are often required for this type of photography, the new way is to allow wide -angle cameras to be integrated into smartphones and digital cameras for mobile devices. vehicles such as cars and drones.
Tao Li and colleagues from Nanjing University in China show off their new ultrathin camera Optics. The new camera, which is only 0.3 centimeters thick, can produce clear images of a scene with a viewing angle greater than 120 degrees.
Widescreen photography is essential to capture as much information as possible to produce stunning, high -quality images. For machine information applications such as autonomous navigation and drone surveillance, wide -angle photography can increase performance and safety, for example by showing an area that you can see differently. more than supporting a car.
“To create a high -resolution wide -angle lens, we used a kind of metal to capture each of the pieces of the wide -angle image,” Li said. “Then the images are stitched together to create a wide -angle image without compromising the quality of the image.”
Slightly reduce the wide -angle lens
Widescreen photography is often used with a fish eye contact lens or other types of multilayer lenses. Although researchers have previously tried to use metals to make wide -angle cameras, they are frustrated by poor image quality or other consequences.
In the new work, the researchers used a well -designed metal object to accurately focus on different parts of the lighting angles. This allows each lens to clearly capture a portion of a wide area or feature. The best parts of each picture can be sewn together to create the final image.
“Thanks to the simple design of the metasurfaces, the operation and image of each lens can be captured independently,” says Li. “This produces a high -end wide -angle image after the sewing process. In addition, the pattern can be made using a single layer of materials, to help reduce the cost. . ”
See more with flat lenses
To demonstrate the new method, the researchers used nanofabrication to create a metal object and directly attach it to a CMOS sensor, creating a planar camera measuring approximately 1 cm × 1 cm. × 0.3 cm. They then used this camera to capture a wide -angle view created by using two projectors to illuminate a curved screen surrounding the camera at a distance of 15 cm.
They compared their new design camera with one based on a single traditional metal while capturing the words “Nanjing University” printed on the curved side. The planar compass produced an image that accurately represented each letter and had a viewing angle greater than 120 °, more than three times larger than the corresponding compass. measuring traditional metals.
The researchers note that the planar camera in this study used individual metals only 0.3 millimeters in diameter. They plan to increase these by about 1 to 5 millimeters to increase the quality of the image. After optimization, the array can be optimized to reduce the cost of each element.
Colored metals enhance the visual experience
Ji Chen et al, A wide -angle imaging technique used by metalens arrays, Optics (2022). DOI: 10.1364 / OPTICA.446063
Directions: Researchers make small-wide angle mills with flat metals (2022, April 14) Retrieved April 14, 2022 from https://phys.org/news/2022-04-miniature-wide-angle -camera-flat-metalenses.html
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