This $450,000 three-year Project Grant from the National Science Foundation's Division of Electrical, Communications and Cyber Systems, under the Engineering program (CFDA 47.041), will support the University of Notre Dame in developing high performance optically-controlled radio frequency switches with ferroelectric latching for advanced reconfigurable millimeter-wave to terahertz circuits. The university will investigate and demonstrate a novel switching technology using lightwave control and the unique properties of ferroelectric materials to deliver superior performance compared to conventional semiconductor switches, emerging phase-change material counterparts, and some micro-electromechanical system switches. Researchers will integrate ferroelectric hafnium zirconium oxide to provide non-volatile retention of switch states and low power consumption. Spatially programmable optical modulation will enable application in large-scale arrays. The new switches will be employed to experimentally demonstrate tunable and reconfigurable millimeter-wave to terahertz prototypes, including reconfigurable filters and switch-based beam-steering or beam-forming antennas.