Fig. 2: Focusing of optical energy using a monolayer TMDC material lens.
From: Diffraction-limited imaging with monolayer 2D material-based ultrathin flat lenses
a Phase and amplitude modulations arising from WO2 nanoparticles with different diameters. b Simulated index profile of the WSe2 lens. c Simulated amplitude and phase distributions of the WSe2 lens. d 3D focal spot from experimental measurement. e 3D focal spot from theoretical simulation. Cross-sectional images of the focal spot from the experiment (f, g) and simulation (h, i). Cross-sectional intensity plots along the y-direction (j) and z-direction (k)
