Refractive index database

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Optical constants of AgBr (Silver bromide)
Polyanskiy et al. 2024: n 0.495–12.7 µm

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants

Dispersion formula [ i ]



M. N. Polyanskiy, I. V. Pogorelsky, M. Babzien, K. L. Vodopyanov, M. A. Palmer. Nonlinear refraction and absorption properties of optical materials for high-peak-power long-wave-infrared lasers, Opt. Mater. Express 14, 696–714 (2024)
(fit of data from Schröter-1931 and McCarthy-1973)


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Silver bromide, AgBr

AgBr, or silver bromide, is an inorganic compound that has been extensively studied for its photo-sensitive properties. This ionic material forms a face-centered cubic crystal structure and exhibits a direct bandgap, making it an effective absorber of photons. Historically, AgBr has been a key material in traditional photographic films, where exposure to light leads to the reduction of the material and the formation of elemental silver, thereby creating a visible image. In the realm of modern technology, AgBr is being explored for its utility in optoelectronic devices, such as photodetectors and solar cells. Its wide bandgap and high refractive index make it suitable for applications requiring spectral selectivity and efficient light-matter interactions. However, it is sensitive to environmental factors like humidity and needs to be carefully encapsulated or treated to maintain its optical characteristics. In addition to its bulk form, AgBr nanostructures have also been studied for their unique optical and catalytic properties. Overall, AgBr continues to be a material of significant interest in both historical and emerging technologies, thanks to its unique photo-responsive behavior and optoelectronic properties.

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