High refractive index and extreme biaxial optical anisotropy of rhenium diselenide for applications in all-dielectric nanophotonics

Title	High refractive index and extreme biaxial optical anisotropy of rhenium diselenide for applications in all-dielectric nanophotonics
Authors	Anton A. Shubnic, Roman G. Polozkov, Ivan A. Shelykh, Ivan V. Iorsh
Magazine	Nanophotonics
Date	10/28/2020
DOI	10.1515/nanoph-2020-0416
Introduction	This study introduces a quantitative criterion for identifying novel dielectric materials with high refractive indices in the visible spectrum. It shows that for light frequencies below the bandgap, the refractive index is influenced by the dimensionless parameter η, calculated as the ratio of the sum of the conduction and valence band widths to the bandgap. Materials with small η values, often featuring flat bands, exhibit significantly increased refractive indices. This principle is demonstrated using rhenium dichalcogenides, with ab initio calculations predicting refractive indices greater than 5 in a broad frequency range around 1 eV, accompanied by low optical losses. These insights pave the way for discovering new high-index, low-loss materials for all-dielectric nanophotonics.
Quote	Anton A. Shubnic, Roman G. Polozkov and Ivan A. Shelykh et al. High refractive index and extreme biaxial optical anisotropy of rhenium diselenide for applications in all-dielectric nanophotonics. Nanophotonics. 2020. Vol. 9(16):4737-4742. DOI: 10.1515/nanoph-2020-0416
Element	Selenium (Se)
Industry	Optics

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