Multifunctional Nonlocal Metasurfaces

TL;DR

This paper introduces a new design approach for multifunctional nonlocal metasurfaces that can produce narrowband, wavelength-specific wavefronts while remaining transparent elsewhere, combining advantages of local and nonlocal photonic devices.

Contribution

The paper presents a rational design paradigm using quasi-bound states in the continuum to create metasurfaces with multifunctional, wavelength-selective, and transparent properties, advancing photonic device capabilities.

Findings

Successfully designed metasurfaces with narrowband, wavelength-specific wavefront control

Achieved transparency outside targeted wavelengths

Demonstrated multifunctionality in nonlocal photonic devices

Abstract

Diffractive photonic devices manipulate light via local and nonlocal optical modes. Local devices, such as metasurfaces, can shape a wavefront at multiple selected wavelengths, but inevitably modify light across the spectrum; nonlocal devices, such as grating filters, offer great frequency selectivity but limited spatial control. Here, we introduce a rational design paradigm using quasi-bound states in the continuum to realize multifunctional nonlocal devices: metasurfaces that produce narrowband spatially tailored wavefronts at multiple selected wavelengths and yet are otherwise transparent.