Refractive index database

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Optical constants of Au (Gold)
Werner et al. 2009: n,k 0.0176–2.48 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


Experimental data: Derived from reflection electron energy-loss spectroscopy (REELS) spectra.


W. S. M. Werner, K. Glantschnig, C. Ambrosch-Draxl. Optical constants and inelastic electron-scattering data for 17 elemental metals, J. Phys Chem Ref. Data 38, 1013-1092 (2009)


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Gold, Au

Gold (Au) is a noble metal renowned for its unique combination of chemical stability, high reflectivity, and excellent electrical conductivity. In optics, gold is often used as a thin-film coating for mirrors and other optical components, particularly in applications requiring high reflectivity in the infrared range. Its stability against oxidation and corrosion ensures long-lasting performance, making it a preferred material for harsh or sensitive environments. Gold nanoparticles have also garnered attention in the field of plasmonics, where they are used to manipulate light on the nanoscale and have found applications in sensing, imaging, and photothermal therapy. Unlike many other metals, gold's optical properties are relatively consistent over a broad range of conditions, but it's important to note that its refractive index and other optical characteristics can vary based on its form—be it bulk, thin film, or nanoparticle. Given its unique attributes and versatility, gold remains an invaluable material in both classical and cutting-edge optical technologies.

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