Refractive index database

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Optical constants of MoS2 (Molybdenum disulfide)
Song et al. 2019: 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: c-sapphire


10-layer, 10L


B. Song, H. Gu, M. Fang, X. Chen, H. Jiang, R. Wang, T. Zhai, Y.-T. Ho, S. Liu. Layer-dependent dielectric function of wafer-scale 2D MoS2, Adv. Optical Mater. 7, 1801250 (2019) (Numerical data kindly provided by Baokun Song)


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Molybdenum disulfide, MoS2

Molybdenum disulfide (MoS2) is a naturally occurring, dark gray or black compound that feels similar to graphite. This similarity is due to its layered structure where each molybdenum atom is sandwiched between two sulfur atoms in a trigonal prismatic coordination. The layers are held together by weak van der Waals forces, allowing them to easily slide over each other. This property renders MoS2 useful as a lubricant in various applications. Optically, MoS2 has gained significant attention because, when exfoliated to single layers, it behaves as a direct bandgap semiconductor, making it highly relevant for optoelectronic devices. Thin layers of MoS2 have been investigated for their use in transistors, sensors, and other nanoscale devices due to their unique electronic and optical properties.

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