Differentiable Inverse Design of Free-form Meta-optics Using Multiplicative Filter Network

Recent developments in automatic differentiation enhance the inverse design methodologies for optimizing flexible and free-form meta-optical devices. This study introduces an inverse design framework that merges a fully differentiable rigorous diffraction interface theory solver with a multiplicative filter network, serving as a generator for free-form meta-atoms. The simulation outcomes confirm that our framework effectively meets its design objectives, optimizing two wide-band mid-infrared beam deflectors for TE and TM modes and enhancing transmission efficiencies to as much as 80% at target wavelengths.