Researchers have developed a new ultra-thin film that can create detailed 3D images viewable under normal illumination without any special reading devices.
“Our light film, which is very small, integrated makes a picture that can be viewed at various levels and appear physically deep,” said research team leader Su Shen of Soochow University in China. “It can be easily laminated anywhere on the surface like a tag or sticker or combined with a transparent substrate, making it suitable for use as a protection against money laundering or identity cards.”
In Optic Letters, researchers described their new imaginative film. At a thickness of 25 microns, the film is about twice as thick as a plastic wrap. It uses a technology known as light-field imaging, which captures the direction and magnitude of all the rays of light in a square to create a 3D image.
“Achieving glassless 3D images with a large field of viewing, a smooth parallax and a wide, deep range under natural viewing conditions is one of the most exciting challenges for optics,” says Shen. “Our approach offers a new way to access vivid 3D images that do not cause discomfort or fatigue of viewing, are easy to visualize and entertain with beauty.”
Very high-quality recording
Various technical schemes have been investigated to create the perfect 3D viewing experience, but they often suffer from obstacles such as limited viewing angle or low light intensity. To overcome these shortcomings, researchers have developed an imaginative light field imaging film with a new algorithm that allows both position and angular information to illuminate the light field.
Researchers are also developing an economical method of freeing nanoimprinting lithography that can achieve the accuracy needed for high optical performance while using less expensive materials. The film is patterned with a series of brightly colored objects on one side that act as small cameras, while the other contains a micropattern of the same members that encode the image for display.