Waveguide Holography: Towards True 3D Holographic Glasses

Jang, Changwon; Bang, Kiseung; Chae, Minseok; Lee, Byoungho; Lanman, Douglas

doi:10.21203/rs.3.rs-2118818/v1

Cited by 3 publications

(1 citation statement)

References 57 publications

(63 reference statements)

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“…[ 7,8 ] In the first several works, the optical components should be set on the optical bench, with the limited spatial resolution of the virtual image. Thanks to the optimization of the system [ 9,10 ] and the introduction of the neural network, [ 11–13 ] part of the system can be compact and the spatial resolution has been improved. Due to the remarkable progress, more intentions from both academia and industry have been paid within these two years.…”

Section: Introductionmentioning

confidence: 99%

Retinal Projection Near‐Eye Displays with Huygens’ Metasurfaces

Song

Liang

et al. 2023

Advanced Optical Materials

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Most of current commercial near‐eye 3D displays use traditional stereoscopic approach to generate the 3D information. A well‐known issue for this type of technology is the vergence and accommodation conflict, which leads to visual confusion and fatigue for the viewer. To address this problem, a proof‐of‐concept solution based on retinal projection technology has been developed to provide accommodation‐free virtual images by using a small aperture (360 µm × 360 µm) transparent Huygens’ metasurface hologram as the display device. The virtual image is generated using a visible laser illuminating a metasurface hologram, which is then directly projected onto the retina using an optical see‐through eyepiece. Using this concept, this work experimentally demonstrates a compact and wearable near‐eye display of light weight (≈50 g, including spectacle frames, light source, and battery) creating accommodation‐free images (clear ranging from 0.5 to 2 m), overlaid with the real world and directly viewed by naked eye. To do so, a new design method is introduced for retinal projection near‐eye displays that, inherently, is able to solve the vergence‐accommodation conflict using a small aperture Huygens’ metasurface hologram.

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Section: Introductionmentioning

confidence: 99%

Retinal Projection Near‐Eye Displays with Huygens’ Metasurfaces

Song

Liang

et al. 2023

Advanced Optical Materials

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Stochastic Light Field Holography

Schiffers,

Chakravarthula,

Matsuda

et al. 2023

2023 IEEE International Conference on Computational Photography (ICCP)

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Metagrating meets the geometry-based efficiency limit for AR waveguide in-couplers

et al. 2023

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Recently, augmented reality (AR) displays have attracted considerable attention due to the highly immersive and realistic viewer experience they can provide. One key challenge of AR displays is the fundamental trade-off between the extent of the field-of-view (FOV) and the size of the eyebox, set by the conservation of etendue sets this trade-off. Exit-pupil expansion (EPE) is one possible solution to this problem. However, it comes at the cost of distributing light over a larger area, decreasing the overall system's brightness. In this work, we show that the geometry of the waveguide and the in-coupler sets a fundamental limit on how efficient the combiner can be for a given FOV. This limit can be used as a tool for waveguide designers to benchmark the in-coupling efficiency of their in-coupler gratings. We design a metasurface-based grating (metagrating) and a commonly used SRG as in-couplers using the derived limit to guide optimization. We then compare the diffractive efficiencies of the two types of in-couplers to the theoretical efficiency limit. For our chosen waveguide geometry, the metagrating's 28% efficiency surpasses the SRG's 20% efficiency and nearly matches the geometry-based limit of 29% due to the superior angular response control of metasurfaces compared to SRGs. This work provides new insight into the efficiency limit of waveguide-based combiners and paves a novel path toward implementing metasurfaces in efficient waveguide AR displays.

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Waveguide Holography: Towards True 3D Holographic Glasses

Cited by 3 publications

References 57 publications

Retinal Projection Near‐Eye Displays with Huygens’ Metasurfaces

Retinal Projection Near‐Eye Displays with Huygens’ Metasurfaces

Stochastic Light Field Holography

Metagrating meets the geometry-based efficiency limit for AR waveguide in-couplers

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