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arXiv · 2309.14668

Depolarized Holography with Polarization-multiplexing Metasurface

Seung-Woo Nam·Youngjin Kim·Dongyeon Kim·Yoonchan Jeong
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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.

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Seung-Woo Nam, Youngjin Kim, Dongyeon Kim, Yoonchan Jeong. 2023-09-26. Depolarized Holography with Polarization-multiplexing Metasurface. https://arxiv.org/abs/2309.14668

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