Natural Hyperbolicity of Hexagonal Boron Nitride in the Deep Ultraviolet
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arXiv
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| Autori principali: | , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866918096398188544 |
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| author | Choi, Bongjun Lynch, Jason Chen, Wangleong Jeon, Seong-Joon Cho, Hyungseob Yang, Kyungmin Kim, Jonghwan Engheta, Nader Jariwala, Deep |
| author_facet | Choi, Bongjun Lynch, Jason Chen, Wangleong Jeon, Seong-Joon Cho, Hyungseob Yang, Kyungmin Kim, Jonghwan Engheta, Nader Jariwala, Deep |
| contents | Hyperbolic media enable unique optical phenomena including hyperlensing, negative refraction, enhanced photonic density of states (PDOS), and highly confined polaritons. While most hyperbolic media are artificially engineered metamaterials, certain natural materials with extreme anisotropy can exhibit hyperbolic dispersion. Here, we report the first observation of natural hyperbolic dispersion in hexagonal boron nitride (hBN) in the deep-ultraviolet (DUV) regime, induced by strong, anisotropic exciton resonances. Using imaging spectroscopic ellipsometry (ISE), we characterize the complex dielectric function along in-plane and out-of-plane directions down to 190 nm (6.53 eV), revealing a type-II hyperbolic window in the DUV regime. This hyperbolicity supports hyperbolic exciton polaritons (HEP) with high directionality and slow group velocity. Our findings establish hBN as a promising platform for nanophotonic applications in the technologically significant DUV spectral range. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_13271 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Natural Hyperbolicity of Hexagonal Boron Nitride in the Deep Ultraviolet Choi, Bongjun Lynch, Jason Chen, Wangleong Jeon, Seong-Joon Cho, Hyungseob Yang, Kyungmin Kim, Jonghwan Engheta, Nader Jariwala, Deep Optics Applied Physics Hyperbolic media enable unique optical phenomena including hyperlensing, negative refraction, enhanced photonic density of states (PDOS), and highly confined polaritons. While most hyperbolic media are artificially engineered metamaterials, certain natural materials with extreme anisotropy can exhibit hyperbolic dispersion. Here, we report the first observation of natural hyperbolic dispersion in hexagonal boron nitride (hBN) in the deep-ultraviolet (DUV) regime, induced by strong, anisotropic exciton resonances. Using imaging spectroscopic ellipsometry (ISE), we characterize the complex dielectric function along in-plane and out-of-plane directions down to 190 nm (6.53 eV), revealing a type-II hyperbolic window in the DUV regime. This hyperbolicity supports hyperbolic exciton polaritons (HEP) with high directionality and slow group velocity. Our findings establish hBN as a promising platform for nanophotonic applications in the technologically significant DUV spectral range. |
| title | Natural Hyperbolicity of Hexagonal Boron Nitride in the Deep Ultraviolet |
| topic | Optics Applied Physics |
| url | https://arxiv.org/abs/2507.13271 |