Breaking refractive index records with layered van der Waals GeS<sub>2</sub> for blue and near-ultraviolet photonics

Pavel Shafirin; Mozakkar Hossain; Artur Davoyan

doi:10.1038/s41377-025-02070-y

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Breaking refractive index records with layered van der Waals GeS₂ for blue and near-ultraviolet photonics

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- Breaking refractive index records with layered van der Waals GeS₂ for blue and near-ultraviolet photonics
- Light: Science & Applications Vol. 15, Issue 1, Pages: 11-13(2026)
- Affiliations：
  
  Department of Mechanical and Aerospace Engineering, University of California, Los Angeles 90095 CA, USA
- Author bio：
  
  Artur Davoyan (davoyan@seas.ucla.edu)
- Funds：
- DOI：10.1038/s41377-025-02070-y
  CLC：
- Published Online：02 January 2026，
  
  Published：31 January 2026
- Accepted：
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Shafirin, P., Hossain, M. & Davoyan, A. Breaking refractive index records with layered van der Waals GeS₂ for blue and near-ultraviolet photonics. Light: Science & Applications, 15, 11-13 (2026).
DOI：

Shafirin, P., Hossain, M. & Davoyan, A. Breaking refractive index records with layered van der Waals GeS₂ for blue and near-ultraviolet photonics. Light: Science & Applications, 15, 11-13 (2026). DOI： 10.1038/s41377-025-02070-y.

摘要

Abstract

GeS

a layered a wide bandgap van der Waals material

is now found to exhibit record-high refractive index and extreme optical anisotropy across blue and near-ultraviolet bands

promising bright future for short-wavelength photonics.

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Keywords

references

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Ling, H. N., Li, R. J. & Davoyan, A. R. All van der Waals integrated nanophotonics with bulk transition metal dichalcogenides. ACS Photonics 8 , 721–730 (2021)..

Munkhbat, B. et al. Optical constants of several multilayer transition metal dichalcogenides measured by spectroscopic ellipsometry in the 300–1700 nm range: high index, anisotropy, and hyperbolicity. ACS Photonics 9 , 2398–2407 (2022)..

Liu, C. H. et al. Ultrathin van der Waals metalenses. Nano Lett. 18 , 6961–6966 (2018)..

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Ling, H. N. et al. Deeply subwavelength integrated excitonic van der Waals nanophotonics. Optica 10 , 1345–1352 (2023)..

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Slavich, A. S. et al. Germanium disulfide as an alternative high refractive index and transparent material for UV-visible nanophotonics. Light Sci. Appl. 14 , 213 (2025)..

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Zhang, C. et al. Low-loss metasurface optics down to the deep ultraviolet region. Light Sci. Appl. 9 , 55 (2020)..

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Breaking refractive index records with layered van der Waals GeS2 for blue and near-ultraviolet photonics

DOI：10.1038/s41377-025-02070-y

摘要

Abstract

关键词

Keywords

references

Breaking refractive index records with layered van der Waals GeS₂ for blue and near-ultraviolet photonics