A nonlocal metasurface for optical edge detection in the far-field.

ABSTRACT: Recent studies on nonlocal metasurfaces have shown possibilities of optical image processing, such as edge detection, without the need for Fourier optics and have significantly reduced the form factor. However, the analog edge detection using nonlocal metasurfaces still requires the use of multiple lenses to image the edge-enhanced results, and the edge-detected image generally suffers from image distortion originating from the free space propagation before reaching the detector otherwise. In this work, we propose a nonlocal metasurface that not only enhances the edge features but also delivers them to the far-field with considerably less distortion by combining the conventional edge detection metasurface with a uniaxial slab that has a transfer function of the free space with a negative p

SUBMITTER: Lee D 

PROVIDER: S-EPMC12717890 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature