Optimized 3D metasurface for maximum light deflection at visible range

Abstract : In this contribution, we use two different efficient global optimization techniques in order to optimize 3D real life gradient metasurface based on GaN semiconductor. Our results show that we can achieve more than 87% of diffrac-tion efficiency at the visible regime using only 150 solver calls for optimizing 12 parameters. Our methods seem to be more efficient than other optimization techniques that require costly simulations, especially for 3D structures. The optimized structure will be fabricated and characterized experimentally .