Natural optical anisotropy of h-BN: Highest giant birefringence in a bulk crystal through the mid-infrared to ultraviolet range - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Physical Review Materials Année : 2018

Natural optical anisotropy of h-BN: Highest giant birefringence in a bulk crystal through the mid-infrared to ultraviolet range

A Segura
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L. Artus
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R. Cusco
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Takashi Taniguchi
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Guillaume Cassabois
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Bernard Gil
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Résumé

The giant birefringence of layered h-BN was demonstrated by analyzing the interference patterns in reflectance and transmittance measurements in the mid-infrared to the deep ultraviolet energy range. The refractive index for polarization perpendicular to the c axis is much higher than the refractive index for polarization parallel to the c axis, and it displays a strong increase in the ultraviolet range that is attributed to the huge excitonic effects arising from the unique electronic structure of h-BN. Thus, h-BN is shown to exhibit a giant negative birefringence that ranges from −0.7 in the visible to −2 in the deep ultraviolet close to the band gap. The electronic dielectric constants for polarization perpendicular and parallel to the c axis were determined to be ε∞⊥ = 4.95 and ε∞∥ = 2.86, respectively. The anisotropy we find in high-quality h-BN is significantly larger than proposed in previous experimental studies but in excellent agreement with ab initio calculations.
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Dates et versions

hal-01712338 , version 1 (02-06-2021)

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Citer

A Segura, L. Artus, R. Cusco, Takashi Taniguchi, Guillaume Cassabois, et al.. Natural optical anisotropy of h-BN: Highest giant birefringence in a bulk crystal through the mid-infrared to ultraviolet range. Physical Review Materials, 2018, 2, pp.024001. ⟨10.1103/PhysRevMaterials.2.024001⟩. ⟨hal-01712338⟩
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