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Reconfigurable metasurfaces

Directed, filmed, and edited by Sergii Dogotar & Andrei Dziarkach. Recent progress in nanophotonics enabled planar-interface systems, termed as metasurfaces, which hold a potential to extend the functionalities of light manipulation and provide size, weight, power and cost (SWAP-C) benefits. Significant efforts nowadays are geared towards building active metasurfaces, which properties can be varied post-fabrication. Numerous switchable meta-devices have been demonstrated, however, almost all of them either have a miniscule tuning range or suffer from excessive optical losses. In this seminar, I will share our team’s approach to implement high-performance reconfigurable metasurfaces made of low-loss optical phase-change materials. More specifically, we have developed a new non-volatile chalcogenide alloy exhibiting high index contrast and broadband transparency in both amorphous and crystalline states. Based on this material platform, we demonstrated a mid-IR varifocal metalens, on-chip electrically-controlled active metasurfaces functioning as a tunable filter and a beam deflector in near IR. Our work demonstrates that non-mechanical active metasurfaces can achieve optical quality on par with conventional precision bulk optics involving mechanical moving parts, thereby, pointing to a cohort of exciting applications fully unleashing the SWaP C benefits of active metasurface optics in imaging, sensing, display, and optical ranging.