Leaky Guided Mode-Induced Large-Angle Nonlocal Metasurfaces

• DOI: 10.1021/acsphotonics.4c01744
• Publication Date: 2025-01-01T17:08:01Z
• Authors: Dongmin Jeon; Hongyoon Kim; Junsuk Rho
• Keywords: Leaky mode; Mode (computer interface)

Metasurfaces that can manipulate light in the spatial domain via local modes are an ultrathin alternative to conventional optical systems. However, achieving large-angle modulation with such metasurfaces presents significant challenges as diminished efficiency. To address this, concept of metagrating has been introduced, facilitating development devices a high numerical aperture or wide field view. Nonlocal metasurfaces, which possess nonlocal and control both temporal domains, encounter even greater difficulties due mode degradation wavelength-period dependency, but effective solution not proposed yet. Here, we devised method for realizing by inducing multiple leaky guided (LGMs) using minimally perturbed meta-atom array conjunction waveguide slab. A system achieves spectral leveraging geometric phase additional grating vector coupling between LGMs is designed, this quality factor diffraction efficiency 2.2 × 103 29%, respectively, at extreme deflection angle 79°. This investigation holds potential applications systems requiring wavelength-selective modulation, augmented reality harmonic generation.