Optimization and Inverse-design Techniques for Metalens Synthesis

摘要

Phase-gradient metasurfaces enable designers totailor the behavior of electromagnetic waves at surfaces byexploiting the generalized form of Snell’s law. This ability hasled to the investigation of metalenses which have the potentialto significantly reduce the size, weight, and power (SWaP) ofconventional optical systems. While traditional lenses are madefrom individual glasses, metalenses are comprised of patternedmeta-atom unit cells which are arranged in such a way so as to givethe metalens its desired behavior. Therefore, any metalens’sperformance is ultimately determined by that of its underlyingunit cell components. However, designing meta-atoms thatsimultaneously achieve high performance over wide frequencybandwidths and fields-of-view is an extremely challengingproblem that is best addressed with powerful optimization andinverse-design techniques.