How can one calculate the effective refractive index due to metal (gold or silver) nanoparticles suspended in a dielectric medium (liquid)?

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How gold procurement?

Please note it

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Shavkat Nizamov

Check effective medium approximation, Maxwell-Garnett and Bruggeman models.

Zsuzsanna Heiner

It depends on the shape of the particles: effective medium theory, Lorentz-Lorenz, Maxwell-Garnet, Polder & van Santen, etc..

Dr. Ghanshyam Singh

Refer Kretschmann’s configuration SPR sensor which can provide enough information.

Subodh K Sharma

You may also look section 4.3 in "Light Scattering by Small Particles" in van de Hulst