Design of broadband and wide-field-of-view metalenses
Fan Yang, Sensong An, Mikhail Y. Shalaginov, Hualiang Zhang, Clara Rivero‐Baleine, Juejun Hu, Tian Gu
Abstract
In this Letter, we adapt the direct search method to metasurface optimization. We show that the direct search algorithm, when coupled with deep learning techniques for free-form meta-atom generation, offers a computationally efficient optimization approach for metasurface optics. As an example, we apply the approach to optimization of achromatic metalenses. Taking advantage of the diverse dispersion responses of free-form meta-atoms, metalenses designed using this approach exhibit superior broadband performances compared to their multilevel diffractive counterparts. We further demonstrate an achromatic and wide-field-of-view metalens design.