S20-278 Tunable, On-Chip Beamsteering with Resonant, Electrically-Reconfigurable Phase Gradient Metasurfaces The Dionne lab has developed ultrathin and compact devices for electrically driven beamsteering that fit on a semiconductor chip. These devices rely on resonant dielectric nanostructured surfaces known as "high quality factor" (high-Q) metasurfaces. Jennifer Dionne Mark Lawrence David Barton Elissa Klopfer Sahil Dagli