Refractive index database

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Optical constants of Bi2Se3 (Bismuth selenide)
Fang et al. 2020: 10-layer (10L) film; n,k 0.193–1.69 µm

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants

Conditions & Spec sheet

n_is_absolute: true
wavelength_is_vacuum: true
film_thickness: 10L
substrate: sapphire


10-layer, 10L


M. Fang, Z. Wang, H. Gu, M. Tong, B. Song, X. Xie, T. Zhou, X. Chen, H. Jiang, T. Jiang, S. Liu, Layer-dependent dielectric permittivity of topological insulator Bi2Se3 thin films. Appl. Surf. Sci. 509, 144822 (2020) (Numerical data kindly provided by Baokun Song)


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Bismuth selenide, Bi2Se3

Bi2Se3, or bismuth selenide, is a layered compound with a rhombohedral crystal structure that has gained significant attention for its topological insulator properties. This material exhibits unique electronic states on its surface, while behaving as an insulator in its bulk. In the realm of optics, Bi2Se3 has shown promise for applications in photodetectors, modulators, and even as a platform for exploring exotic quantum phenomena. It has a high refractive index and exhibits strong optical anisotropy due to its layered crystal structure. Bi2Se3 also has a narrow bandgap and shows strong photoresponse across a broad spectrum, making it suitable for infrared applications. While the material can be synthesized through methods such as Bridgman-Stockbarger and chemical vapor deposition (CVD), it is somewhat sensitive to environmental conditions and may require protective coatings to maintain its properties. Overall, Bi2Se3 is a fascinating material that has captivated researchers for its intriguing electronic and optical characteristics, holding promise for future applications in optoelectronics and quantum computing.

Other names

  • Bismuth(III) selenide
  • Dibismuth triselenide
  • Selenoxobismuth
  • Selanylidenebismuth

External links