Refractive index database

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Optical constants of WSe2 (Tungsten diselenide)
Gu et al. 2019: monolayer (1L) 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: 1L
substrate: sapphire


Monolayer (1-layer, 1L)


H. Gu, B. Song, M. Fang, Y. Hong, X. Chen, H. Jiang, W. Ren, and S. Liu, Layer-dependent dielectric and optical properties of centimeter-scale 2D WSe2: evolution from a single layer to few layers. Nanoscale 11, 22762-22771 (2019) (Numerical data kindly provided by Baokun Song)


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Tungsten diselenide, WSe2

Tungsten diselenide (WSe2) is a member of the transition metal dichalcogenide (TMD) family, known for its distinctive layered structure. The individual layers are bound by weak van der Waals interactions, allowing for exfoliation into atomically thin sheets. In its monolayer form, WSe2 possesses a direct bandgap, distinguishing it from its bulk indirect bandgap property. This unique characteristic renders WSe2 as a prime candidate for optoelectronic applications, including photodetectors, light-emitting diodes (LEDs), and even photovoltaic devices. It has also been explored in the fabrication of field-effect transistors and quantum devices. The intriguing electronic and optical attributes of WSe2, especially when interfaced with other 2D materials, have garnered significant attention in advanced materials research.

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