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12 March 2020 Wide-angle and continuously zoomed focus using Moiré metasurface structures
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Metasurfaces are widely applied to realize miniaturized optical devices with high performance, because of the high design freedom. Recently, with the help of optical design, cascaded metalenses with two-layered metasurface, which can correct monochromatic aberration have been proposed for a well-focused light spot in the focal plane at large incident angles. However, the focal length is fixed in these systems. In this paper, we report a wide-angle metalens with continuously tunable focus. Through the optical design method, we obtain a lens phase profile with large field of view. And referring to the principle of Moiré lens, a wide angle (±30°) and continuously zoomed metalens with well focusing at infrared wavelength (810nm) was designed, and its characteristics are verified by numerical simulations. Our metalens has great potential in areas where high imaging quality and tunability.
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Zheng Liu and Bin Hu "Wide-angle and continuously zoomed focus using Moiré metasurface structures", Proc. SPIE 11434, 2019 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 114340X (12 March 2020);

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