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.
We study an ability of a large quasi-homogeneous monolayer of Au plasmon coupled nanoparticles separated from continuous Au film by polymer spacer to enhance a fluorescence of adsorbed molecular species. A fluorescence response of Methylene Blue molecules is studied as a function of polymer film thickness. A change of plasmonic properties of a system, its ability to enhance a fluorescence and the possible heating of a structure upon light absorption are discussed.
We study the surface enhanced Raman scattering of Methylene Blue (MB) dye molecules induced by large quasihomogeneous arrays of plasmon coupled 5-8 nm Au nanoparticle separated by distances less than 10 nm. Also, the variation of the fluorescence enhancement/SERS properties for as-prepared coupled particles and agglomerated particles obtained upon heat treatment and percolation-like films is analyzed for two measurement protocols, i.e. when measured through the solution and for a monolayer of MB molecules chemisorbed on a surface.
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