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Digital Approach to Fabricating Holograms Could Eliminate Bulky Optics in 3D Displays

Photonics Handbook
Through a combination of holography and light-field display, researchers at the National Institute of Information and Communications Technology (NICT) hope to eliminate visual disturbances in augmented and virtual reality (AR/VR) and other 3D technologies without the addition of bulky optics.

“A holographic optical element is a thin sheet of photosensitive material — think photographic film — that can replicate the functions of one or more additional optical components. They aren’t bulky or heavy, and can be adapted into smaller form factors,” said researcher Boaz Jessie Jackin.

However, recording a hologram that can replicate the function of an optical component requires the component to be physically present during the recording process. This approach to recording a hologram is an analog process; no digital signals or information are used. Jackin said that recording multiple optical components requires that all of them be present during the recording process, “which makes it complex and, in most cases, impossible to do.”

The researchers found a way to record a hologram digitally — calling the solution a "digitally designed holographic optical element" (DDHOE) — using a process that requires none of the optical components to be physically present during recording. Instead, the optical components are digitally computed and reconstructed using an LCD and a laser. According to the researchers, the reconstructed optical signal mimics the light modulated by physical optical components during an analog recording process, allowing the digitally recorded hologram to modulate light with all the necessary optical functions. “So all of the additional optics needed can be replaced by a single holographic film,” said Jackin.

Digitally designed holographic optical element (DDHOE), NICT, Boaz Jessie Jackin.
(a) and (b) Object layers I & II. (c) Position of the depth layers with DDHOE. Reconstructed views without a horizontal tilt: (d) left, (e) center, and (f) right. Reconstructed views with a horizontal tilt: (g) left, (h) center, and (i) right. Courtesy of OSA, The Optical Society.

“Our system uses a commercially available 2D projector to display a set of multi-view images onto a microlens array sheet which is usually glass or plastic. The sheet receives the light from the projector and modulates it to reconstruct the 3D images in space, so a viewer looking through the microlens array perceives the image in 3D.”

In order to accurately reconstruct the 3D images in space, light from a 2D projector typically must be collimated before it hits the microlens array. The research team was able to bypass the need for collimation optics by incorporating the collimation function on the microlens array itself. The team went on to create a headup, see-through 3D display, which could soon offer an alternative to the current models that use the bulky collimation optics.

The team will present its work during The Optical Society’s (OSA) Frontiers in Optics, Sept. 16-20, 2018 in Washington, DC.

A research paper was published in Optics Letters, a publication of OSA (doi: 10.1364/OL.43.003738).

GLOSSARY
holography
The optical recording of the object wave formed by the resulting interference pattern of two mutually coherent component light beams. In the holographic process, a coherent beam first is split into two component beams, one of which irradiates the object, the second of which irradiates a recording medium. The diffraction or scattering of the first wave by the object forms the object wave that proceeds to and interferes with the second coherent beam, or reference wave at the medium. The resulting...
Research & TechnologyeducationAsia-PacificNational Institute of Information and Communications TechnologyNICTimagingopticsDisplaysholography3D displaysaugmented realityvirtual realityARVRlight-field display

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