Fig. 3. Simulated point spread function (PSF) for tunable metalens with different applied voltages in the xz plane with normal incident light. PSF or focal spot in the xy plane for an incident wavelength of (a) 488 nm, (b) 532 nm and (c) 633 nm with applied voltages of −8.9, −16.6 and 33.7, respectively. PSF or focal spot in the xz plane for an incident wavelength of (d) 488 nm, (e) 532 nm and (f) 633 nm with applied voltages of −8.9, −16.6 and 33.7, respectively.
