Depolarized Holography with Polarization-Multiplexing Metasurface

LETO / LETO-3 Spatial Light Modulators
AR/VR/MR / Holographic Display Digital-/ Computer Holography/ CGH Materials Processing / Optical Fabrication
Published on:
Authors: Seung-Woo Nam , Youngjin Kim , Dongyeon Kim , Yoonchan Jeong
Abstract:

The evolution of computer-generated holography (CGH) algorithms has prompted significant improvements in the performances of holographic displays. Nonetheless, they start to encounter a limited degree of freedom in CGH optimization and physical constraints stemming from the coherent nature of holograms. To surpass the physical limitations, we consider polarization as a new degree of freedom by utilizing a novel optical platform called metasurface. Polarization-multiplexing metasurfaces enable incoherent-like behavior in holographic displays due to the mutual incoherence of orthogonal polarization states. We leverage this unique characteristic of a metasurface by integrating it into a holographic display and exploiting polarization diversity to bring an additional degree of freedom for CGH algorithms. To minimize the speckle noise while maximizing the image quality, we devise a fully differentiable optimization pipeline by taking into account the metasurface proxy model, thereby jointly optimizing spatial light modulator phase patterns and geometric parameters of metasurface nanostructures. We evaluate the metasurface-enabled depolarized holography through simulations and experiments, demonstrating its ability to reduce speckle noise and enhance image quality.

Open Access

Publication: ACM Transactions on Graphics
Issue/Year: ACM Trans. Graph., Volume 42, Issue 6, Article No.: 202pp 1–16 (2023)
DOI: 10.1145/3618395
Link: https://doi.org/10.1145/3618395

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