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We show that bulk rhenium diselenide, ReSe2 is characterized by record highvalue of the refractive index exceeding 5 in near-infrared frequency range. Weuse back focal plane reflection spectroscopy to extract the components of theReSe2 permittivity tensor and reveal its extreme biaxial anisotropy. We alsodemonstrate the good agreement between the experimental data and thepredictions of the density functional theory. The combination of the largerefractive index and giant optical anisotropy makes ReSe2 a perspectivematerial for all-dielectric nanophotonics in the near-infrared frequency range.

Bulk ReSe2: record high refractive index and biaxially anisotropic material for all-dielectric nanophotonics