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In article number 1908176, Joshua D. Caldwell, Alexey Y. Nikitin, Pablo Alonso‐González, and co‐workers extract the IR permittivity of the biaxial crystal α‐MoO3 by correlative far‐ and near‐field measurements, using FTIR reflectance spectroscopy and s‐SNOM polariton interferometry, thus providing both an accurate permittivity model and a novel approach to extracting dielectric functions of nanomaterials...
The biaxial van der Waals semiconductor α‐phase molybdenum trioxide (α‐MoO3) has recently received significant attention due to its ability to support highly anisotropic phonon polaritons (PhPs)—infrared (IR) light coupled to lattice vibrations—offering an unprecedented platform for controlling the flow of energy at the nanoscale. However, to fully exploit the extraordinary IR response of this material,...
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