Abstract
The experimental study of the effect of temperature on the complex optical response of matrix-embedded noble metal nanoparticles has been carried out. A thin silica film containing gold nanoparticles with 7% volume fraction has been elaborated. Its thermo-optical refraction and absorption coefficients have then been extracted from temperature-dependent spectroscopic ellipsometry measurements in the visible range. The results, in agreement with our theoretical approach, exhibit strong dispersion, with amplitude and sign changes due to the local electromagnetic field enhancement associated with the surface plasmon resonance in gold nanoparticles.
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