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Dispersion engineering is essential to the performance of most modern opticalsystems including fiber-optic devices. Even though the chromatic dispersion ofa meter-scale single-mode fiber used for endoscopic applications is negligible,optical lenses located on the fiber end face for optical focusing and imagingsuffer from strong chromatic aberration. Here we present the design andnanoprinting of a 3D achromatic diffractive metalens on the end face of asingle-mode fiber, capable of performing achromatic andpolarization-insensitive focusing across the entire near-infraredtelecommunication wavelength band ranging from 1.25 to 1.65 um. This representsthe whole single-mode domain of commercially used fibers. The unlocked heightdegree of freedom in a 3D nanopillar meta-atom largely increases the upperbound of the time-bandwidth product of an achromatic metalens up to 21.34,leading to a wide group delay modulation range spanning from -8 to 14 fs.Furthermore, we demonstrate the use of our compact and flexible achromaticmetafiber for fiber-optic confocal imaging, capable of creating in-focus sharpimages under broadband light illumination. These results may unleash the fullpotential of fiber meta-optics for widespread applications includinghyperspectral endoscopic imaging, femtosecond laser-assisted treatment, deeptissue imaging, wavelength-multiplexing fiber-optic communications, fibersensing, and fiber lasers.

An achromatic metafiber for focusing and imaging across the entire telecommunication range