Abstract
Plasmon resonance using gold – silver – copper alloy system is promising materials in the field of enhanced fluorescence, surface enhanced Raman scattering (SERS) and so on. The resonance wavelength and electromagnetic field enhancement of plasmon resonance depends on the permittivity of the metal. We have demonstrated that the optical constants of gold – silver alloy system become different features from the linear combination of each optical constant [1], and revealed the importance of experimentally determination of optical constants. In this study, we determined the optical constants of gold-silver, gold-copper, silver-copper alloy system and explained the relationship between the optical constants and the Drude parameters (ωp; plasma frequency and τ relaxation time)
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