In this paper, optical properties of Au–Ag spherical nanoalloy are investigated by means of Generalized Lorenz–Mie Theory (GLMT) when this nanoparticle is embedded into water. Scattering, extinction and absorption cross-sections of this nanoalloy into water are calculated by changes of incident wavelengths in visible and near infra-red region. Moreover, changes of height and wavelengths of extinction and scattering cross-sections peaks (due to Particle Plasmon Resonances (PPR)) versus alloy percentage for Au–Ag spherical nanoalloy are considered.


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