All dielectric highly efficient achromatic meta-lens using inverse Design Optimization

Abstract

Abstract This work presents a high-efficiency achromatic meta-lens based on inverse design with topology optimization methodology. The meta-lens design with high numerical aperture values (NA = 0.7, NA = 0.8, and NA = 0.9) along the visible band starts from 450 nm to 800 nm. The final optimized structures for the three conditions of the high numerical apertures have high focusing efficiency along the design band. The optimization problem is based on Kreisselmeier–Steinhauser (k-s) objective function, leading to approximately stable response over the broadband bandwidths of the three designs.