Refractive index database

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Optical constants of Ag (Silver)
Ferrera et al. 2019: n,k 0.245–1.45 µm; 404 K

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
temperature: 404 K
substrate: Si/SiO2


404 K (131 °C). Optically thick and morphologically flat polycrystalline Ag film, deposited by molecular beam epitaxy on a silicon wafer with a native oxide substrate.
The supplemental material of the original publication provides extra information by including additional data for 25 temperatures within the range of 298–600 K.


M. Ferrera, M. Magnozzi, F. Bisio, M. Canepa. Temperature-dependent permittivity of silver and implications for thermoplasmonics, Phys. Rev. Mater., 3, 105201 (2019) (See Supplemental Material)


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Silver, Ag

Silver (Ag) is a highly reflective metal known for its excellent electrical and thermal conductivity, making it a material of interest in a variety of optical and electronic applications. In the realm of optics, silver is frequently used as a coating material for mirrors due to its high reflectivity across a broad range of wavelengths, from ultraviolet to infrared. Additionally, silver nanoparticles are employed in plasmonic devices, enhancing light-matter interactions at the nanoscale. While the metal is highly stable under most conditions, it is susceptible to tarnishing in the presence of sulfur compounds, which can diminish its optical performance over time. Silver's unique combination of properties, including its unparalleled reflectivity and high electrical conductivity, makes it a versatile material in the field of optics and photonics. Note that its refractive index can vary depending on the form in which it is used, such as bulk silver, thin films, or nanoparticles, making it crucial to consult specific data for particular applications.

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