Figure 5.

Frequency and Polarization Multifunctional Metalens-Based Devices

(A) Schematic of frequency-dependent metalens for separating focal spots of RGB components. Three frequency multiplexed unit cells consist of four nanopillars: one for red, two for green, and one for blue. Reprinted with permission from (Chen et al., 2017). Copyright 2017, American Chemical Society.

(B) Structure and focusing simulation of a multifunctional metalens in two different bandwidths. The metalens is designed for focusing donut-shaped light at 450–530 nm and focal spot at 620–700 nm by dispersion engineering. Reprinted with permission from (Sisler et al., 2020). Copyright 2020, American Institute of Physics.

(C) Schematic and SEM images of the metalens focusing at different positions in the focal plane for each linear polarization. Scale bars, (left) 20 μm and (right) 200 nm. Reprinted with permission from (Chen et al., 2020a). Copyright 2020, American Chemical Society.

(D) Schematic diagram of spatial polarized states and a phase profile detector with a metalens array. Six different polarization-dependent metalenses make up a sub-pixel in metalens array. Reprinted with permission from (Wang et al., 2020c). Copyright 2020, The Optical Society.