Lensless Kramers–Kronig holography with nonlocal flat optics

Le résumé fourni par la source

Holography enables quantitative access to complex optical fields, supporting applications ranging from biological microscopy to industrial metrology. Although Kramers-Kronig (KK) holography offers an attractive route toward deterministic reconstruction, existing implementations rely on a bulky lens-based 4f system to construct the half-plane-blocked spatial-frequency filter, limiting system miniaturization and reducing alignment tolerance. Here, we demonstrate lensless KK holography enabled by nonlocal flat optics, in which a 2-mm-thick multilayer thin film replaces the conventional 4f system and directly constructs the analytic optical field required for deterministic reconstruction. Using the resulting closed-form KK reconstruction, we recover complex fields from artificial test targets and biological specimens over a 5.52 mm × 5.52 mm field of view with a 4.92 μm half-pitch resolution, while achieving a processing throughput of 1.94 megapixels per second on a laptop. Our approach combines the deterministic reconstruction capability of KK holography with a compact, alignment-tolerant architecture with a large field of view, providing a route toward portable and computationally efficient holographic imaging systems.

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