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2D van der Waals (vdW) layered polar crystals sustaining phonon polaritons (PhPs) have opened up new avenues for fundamental research and optoelectronic applications in the mid‐infrared to terahertz ranges. To date, 2D vdW crystals with PhPs are only experimentally demonstrated in hexagonal boron nitride (hBN) slabs. For optoelectronic and active photonic applications, semiconductors with tunable...
Mid‐infrared hyperbolic phonon polaritons are demonstrated on a van der Waals semiconducting layered oxide, α‐MoO3, as described in article number 1705318 by Weiguang Xie, Huanjun Chen, Shaozhi Deng, Ningsheng Xu, and co‐workers. By using a real‐space near‐field optical nanoimaging technique, the phonon polaritons are shown to exhibit ultrahigh electromagnetic‐field confinement, as well as low damping...
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