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O: Fachverband Oberflächenphysik

O 100: Mini-Symposium: Infrared nano-optics II

O 100.2: Talk

Thursday, March 4, 2021, 14:15–14:30, R2

Configure phonon polaritons in van der Waals materials — •Siyuan Dai — Auburn University, Auburn, United States

The manipulation of light at small scales is one of the ultimate goals for nanophotonics. For this purpose, polaritons * hybrid light-matter waves that propagate in a confined length scale * are typically involved. Recent results of polaritons in van der Waals materials reveal a series of advances, including atomic scale localization, dynamic tunability, relative low-loss and topologically protected states. These advances are attributed to the unique physical properties in reduced dimensions and the configurability through van der Waals structuring and stacking. In this talk, I will show new merits of phonon polaritons that can be obtained through van der Waals configuration. I will talk about the tunability implemented into phonon polaritons by van der Waals heterostructuring hexagonal boron nitride with graphene and vanadium dioxide, where the polaritons can be tuned dynamically and reversibly via electrostatic gating and temperature control. I will also talk about the geometry and topology configuration of phonon polariton wavefront by twisting stacked slabs of molybdenum trioxide.