Research paperExperimental CharacterizationNatural Hyperbolicity of Hexagonal Boron Nitride in the Deep UltravioletBongjun Choi, Jason Lynch, Wangleong Chen, Seong-Joon Jeon et al.2025·10.1038/s41467-026-69536-4·arXiv:2507.13271AbstractUsing imaging spectroscopic ellipsometry, the paper reports deep-ultraviolet excitonic optical response and natural hyperbolic dispersion in exfoliated hexagonal boron nitride (hBN). The authors resolve in-plane and out-of-plane dielectric functions down to 190 nm, identify a type-II hyperbolic window in the DUV, and connect the hyperbolicity to strong anisotropic exciton resonances. Raman spectroscopy is used to assess sample quality.Read more
Mechanically exfoliated hBN flake transferred onto an Al₂O₃ substrate and measured by imaging spectroscopic ellipsometry and Raman spectroscopy.1 preparation4 characterizations9 properties3 figuresExperimentalhBNStudied MaterialAl₂O₃Substrate / DielectricExpand
Research paperExperimental CharacterizationNatural Hyperbolicity of Hexagonal Boron Nitride in the Deep UltravioletBongjun Choi, Jason Lynch, Wangleong Chen, Seong-Joon Jeon et al.2025·10.1038/s41467-026-69536-4·arXiv:2507.13271AbstractUsing imaging spectroscopic ellipsometry, the paper reports deep-ultraviolet excitonic optical response and natural hyperbolic dispersion in exfoliated hexagonal boron nitride (hBN). The authors resolve in-plane and out-of-plane dielectric functions down to 190 nm, identify a type-II hyperbolic window in the DUV, and connect the hyperbolicity to strong anisotropic exciton resonances. Raman spectroscopy is used to assess sample quality.Read more
Mechanically exfoliated hBN flake transferred onto an Al₂O₃ substrate and measured by imaging spectroscopic ellipsometry and Raman spectroscopy.1 preparation4 characterizations9 properties3 figuresExperimentalhBNStudied MaterialAl₂O₃Substrate / DielectricExpand
Research paperExperimental CharacterizationNatural Hyperbolicity of Hexagonal Boron Nitride in the Deep UltravioletBongjun Choi, Jason Lynch, Wangleong Chen, Seong-Joon Jeon et al.2025·10.1038/s41467-026-69536-4·arXiv:2507.13271AbstractUsing imaging spectroscopic ellipsometry, the paper reports deep-ultraviolet excitonic optical response and natural hyperbolic dispersion in exfoliated hexagonal boron nitride (hBN). The authors resolve in-plane and out-of-plane dielectric functions down to 190 nm, identify a type-II hyperbolic window in the DUV, and connect the hyperbolicity to strong anisotropic exciton resonances. Raman spectroscopy is used to assess sample quality.Read more
Mechanically exfoliated hBN flake transferred onto an Al₂O₃ substrate and measured by imaging spectroscopic ellipsometry and Raman spectroscopy.1 preparation4 characterizations9 properties3 figuresExperimentalhBNStudied MaterialAl₂O₃Substrate / DielectricExpand
Research paperExperimental CharacterizationNatural Hyperbolicity of Hexagonal Boron Nitride in the Deep UltravioletBongjun Choi, Jason Lynch, Wangleong Chen, Seong-Joon Jeon et al.2025·10.1038/s41467-026-69536-4·arXiv:2507.13271AbstractUsing imaging spectroscopic ellipsometry, the paper reports deep-ultraviolet excitonic optical response and natural hyperbolic dispersion in exfoliated hexagonal boron nitride (hBN). The authors resolve in-plane and out-of-plane dielectric functions down to 190 nm, identify a type-II hyperbolic window in the DUV, and connect the hyperbolicity to strong anisotropic exciton resonances. Raman spectroscopy is used to assess sample quality.Read more
Mechanically exfoliated hBN flake transferred onto an Al₂O₃ substrate and measured by imaging spectroscopic ellipsometry and Raman spectroscopy.1 preparation4 characterizations9 properties3 figuresExperimentalhBNStudied MaterialAl₂O₃Substrate / DielectricExpand
