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Attend a research seminar exploring how excitonic resonances in atomically thin 2D semiconductors can be harnessed to create tunable optical metasurfaces. Learn about the fundamental efficiency limits of atomically-thin optical elements and their relationship to exciton decay dynamics. Discover how electrical gating enables dynamic control of exciton resonances, allowing researchers to effectively turn these resonances on and off. Examine practical applications including tunable atomically-thin lenses, dynamic beam steering in 2D metasurfaces, and high-efficiency free-space optical modulation in hybrid-2D metasurfaces. Understand how these materials-based resonances offer unprecedented tunability with external stimuli, representing a third type of resonance beyond traditional geometrical plasmonic and Mie resonances used in conventional metasurface designs. Explore the potential of these mutable, flat optics to overcome the limited electrical tunability of current metallic and high-index semiconductor nanostructures while maintaining strong light-matter interaction and excellent control over scattering phase and amplitude.
