The development of reconfigurable metalenses is crucial for various applications including scanning microscopy and 3D imaging. While the focal length of most metalenses is fixed once they are fabricated, realizing dynamically-tunable metalenses can save costs and provide greater flexibility. In this study, an interleaved metasurface was designed to achieve continuous focal length tunability in the visible window. The results showed that the proposed metalens can effectively alter the focal length, offering a promising avenue for developing more versatile and adaptable optical devices.
Metasurface enables controlling the light properties at will by structuring sub-wavelength unit elements. Among feasible applications, polarization control plays a vital role in communication, quantum optics, and imaging. Due to the Joule loss issue, the polarization conversion efficiency for the plasmonic metasurfaces operating at NIR region is usually lower than 10% [1]. In this work, we innovate a metasurface design to enhance the polarization conversion efficiency [2]. A S-shaped plasmonic metasurface with a toroidal dipole-quadrupole coupling response is used to push the polarization conversion efficiency to 22.9% that is very close to the theoretical conversion limit 25% [3].
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