Varifocal Meta-Lens for Multifunctional Focusing and Imaging.

ABSTRACT: Integrating multifunctionality and tunability in beam control is crucial for advanced applications such as adaptive imaging and optical microscopy. However, achieving both capabilities simultaneously in a compact optical system remains challenging, as conventional optics are bulky and typical tunable metasurfaces offer only limited operational modes. Here, polarization-independent varifocal meta-lens is presented, composed of two cascaded metasurfaces, enabling mode switching between a non-diffracting abrupt autofocusing (AAF) beam and a diffraction-limited focusing beam. The mode transition is governed by the dual interpretation of the superimposed phase profile in real space and the spatial frequency domain. A Moiré-based tuning mechanism enables continuous focal length modulation via in

SUBMITTER: Lin R 

PROVIDER: S-EPMC12677681 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature