A team of researchers from Duke University developed a unique approach to multicolor holography in order to provide enhanced 3-D color displays with easier device and accessories.
The researchers encoded a multicolor image onto a 300-by-300 micron hologram in a 2-D waveguide structure, which is an extremely thin structure that guides light. The new discovery is set to revolutionize the computer-generated hologram system. The findings were published in Optica, The Optical Society’s journal in January 2019 issue.
Daniel L. Marks, a member of the research team, said: “The hologram could be embossed directly onto the lenses of augmented reality glasses to project an image directly into the pupil of the eye without requiring any bulky lenses, beam splitters, or prisms. It could also be used to project a 3-D image from a smartphone onto a wall or nearby surface.”
The computer-generated hologram produces complex multicolor holographic images when the grating coupler is lit by the basic red, green, and blue light. The new method can easily be attuned with integrated photonics technology, which will enable in the mass production of the holographic devices.
The team demonstrated the working potential of the new technique, which is based on computer-generated holograms. They showed that computer-generated holography generates interference patterns digitally whereas the conventional techniques relied on a physical object and laser beams to produce the required interference pattern for holographic image.
They fabricated a series of fringes and a binary hologram in a waveguide made of a light-sensitive material known as photoresist in order to obtain high-resolution 3-D images.