Abstract
AbstractDispersion engineering is essential to the performance of most modern optical systems including fiber-optic devices. Even though the chromatic dispersion of a meter-scale single-mode fiber used for endoscopic applications is negligible, optical lenses located on the fiber end face for optical focusing and imaging suffer from strong chromatic aberration. Here we present the design and nanoprinting of a 3D achromatic diffractive metalens on the end face of a single-mode fiber, capable of performing achromatic and polarization-insensitive focusing across the entire near-infrared telecommunication wavelength band ranging from 1.25 to 1.65 µm. This represents the whole single-mode domain of commercially used fibers. The unlocked height degree of freedom in a 3D nanopillar meta-atom largely increases the upper bound 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 achromatic metafiber for fiber-optic confocal imaging, capable of creating in-focus sharp images under broadband light illumination. These results may unleash the full potential of fiber meta-optics for widespread applications including hyperspectral endoscopic imaging, femtosecond laser-assisted treatment, deep tissue imaging, wavelength-multiplexing fiber-optic communications, fiber sensing, and fiber lasers.
Funder
Department of Education and Training | Australian Research Council
Alexander von Humboldt-Stiftung
National Research Foundation of Korea
Hyundai Motor Chung Mong-Koo fellowship NRF-DAAD Summer Institute program funded by the NRF and German Academic Exchange Service
CSC | Chinese Government Scholarship
POSCO-POSTECH-RIST Convergence Research Center program funded by POSCO, an industry-university strategic grant funded by LG Innotek,
Deutsche Forschungsgemeinschaft
RCUK | Engineering and Physical Sciences Research Council
The Lee-Lucas Chair in Physics
Publisher
Springer Science and Business Media LLC
Subject
General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry,Multidisciplinary
Cited by
56 articles.
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