Full-Color Wide-Field Imaging Enabled by a Monolithic SiC Metalens and a Physics-Guided Restoration Network

Metalenses composed of subwavelength meta-atoms enable compact wavefront control for miniaturized imaging systems. However, extending a single metalens to full-color wide-field imaging remains difficult because chromatic aberration and off-axis degradation coexist. Here, we present a full-color wide-field imaging framework that combines a single-wavelength-designed quadratic-phase metalens with a physics-guided restoration network. The monolithic silicon carbide metalens has a 2 mm aperture and an NA of 0.6 and uses cylindrical meta-atoms designed at 532 nm, avoiding complex meta-atom libraries and facilitating fabrication. To restore blurred RGB images captured by the monolithic metalens over an approximately 50° field of view into clear full-color outputs, we develop Phy-FFTformer, a physics-guided frequency-domain transformer with optical frequency-response priors. The method achieves a PSNR of 26.39 dB and an SSIM of 0.7209, offering a route to compact imaging systems for machine vision, robotic and drone vision, portable inspection, and biomedical imaging.