Aberration-free and functionality-switchable meta-lenses based on tunable metasurfaces

Constructing a meta-lens with tunable meta-atoms with varactor diodes incorporated, we can precisely control the phase profile of the meta-lens by varying the external voltages imparted on the diodes, such that the dispersion-induced phase distortions at off-working frequencies can be rectified and the functionality of the meta-lens can be dynamically changed. As an illustration, we design and fabricate a tunable meta-lens in the microwave regime and employ both experiments and numerical simulations to demonstrate the aberration-free and dynamically switchable focusing performances of the meta-lens. Our approach paves the road to achieve dispersion-corrected and switchable manipulations of electromagnetic waves in the microwave regime.