We propose a new method to strudy photothermal effect in large arrays of coupled plasmonic nanoparticles based on monitoring of surface acoustic waves propagating in LiNbO3 substrate. A photothermal effect induced by deposited nanosystem/metasurface results in SAW velocity alteration which a phase shift is detected. In proof-of-concept experiment the visible/near IR polarization/wavelength dependent photothermal responses of macroscopic monolayer of Au plasmonic coupled nanoparticles prepared by self-assembling and the one for larger isolated particles produced by heat treatment were characterized.
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