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Hyperbolic Phonon Polaritons
Launching, controlling, and focusing of in‐plane hyperbolic phonon polaritons in van der Waals α‐MoO3 with geometrically designed curved gold plasmonic antennas are realized by Huanjun Chen, Shaozhi Deng, and co‐workers in article number 2104164. By engineering the curvature of the antenna extremity, it is possible to tune the focal lengths and lateral sizes of the focal...
Hyperbolic phonon polaritons (HPhPs) sustained in polar van der Waals (vdW) crystals exhibit extraordinary confinement of long‐wave electromagnetic fields to the deep subwavelength scale. In stark contrast to uniaxial vdW hyperbolic materials, recently emerged biaxial hyperbolic materials, such as α‐MoO3 and α‐V2O5, offer new degrees of freedom for controlling light in two‐dimensions due to their...
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