Abstract
Monocrystalline gold flakes serve as an atomically-flat low-loss substrate for the highly confined mid-infrared “image polaritons” stemming from hybridization of polaritons with their mirror image in the metal. By leveraging the physical properties of the gold flakes, the strongly anisotropic image phonon polaritons are rigorously studied in a biaxial van der Waals crystal α-MoO3 (see article number 2201492 by Min Seok Jang and co-workers). Notably, the image phonon polaritons provide approximately twice stronger field confinement yet longer lifetime compared to the phonon polaritons on a dielectric substrate.
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