Abstract
The laser-induced plasmon heating of an ordered array of silver nanoparticles, under continuous illumination with an Ar laser, was probed by rare-earth fluorescence thermometry. The rise in temperature in the samples was monitored by measuring the temperature-sensitive photoluminescent emission of a europium complex (EuTTA) embedded in PMMA thin-films, deposited onto the nanoparticles array. A maximum temperature increase of 19 °C was determined upon resonant illumination with the surface plasmon resonance of the nanoarray at the highest pump Ar laser power (173 mW). The experimental results were supported by finite elements method electrodynamic simulations, which provided also information on the temporal dynamics of the heating process. This method proved to be a facile and accurate approach to probe the actual temperature increase due to photo-induced plasmon heating in plasmonic nanosystems.
Highlights
Nowadays plasmonic nanostructures find application in many different fields in nanophotonics, as light harvesting and manipulation[1,2,3], fluorescence enhancement[4,5,6,7], nonlinear optics[8,9,10,11,12,13], biosensing[14,15,16,17,18,19,20], surface-enhanced Raman scattering (SERS)[21,22,23] and medical therapies[24,25,26]
The high sensitivity of the rare-earth photoluminescence to its environment temperature[50], its stable and intense emission in the visible range[51,52], combined with the ease to couple the thermometric probe with the samples (EuTTA-doped PMMA thin-films can be deposited by spin-coating on the substrates and can be removed once the thermal analysis is completed by rinsing the samples in acetone, which will dissolve the film in few minutes without affecting the plasmonic nanostructures) make this method extremely effective for the measurement of the actual temperature increase due to photo-induced heating in plasmonic nanosystems
Rare-earth fluorescence thermometry has been employed to measure the laser-induced plasmon heating of an ordered array of silver nanoparticles synthesized by nanosphere lithography, upon illumination with a cw Ar laser
Summary
Nowadays plasmonic nanostructures find application in many different fields in nanophotonics, as light harvesting and manipulation[1,2,3], fluorescence enhancement[4,5,6,7], nonlinear optics[8,9,10,11,12,13], biosensing[14,15,16,17,18,19,20], surface-enhanced Raman scattering (SERS)[21,22,23] and medical therapies[24,25,26]. In the present work fluorescence thermometry has been employed to probe the local temperature of an array of silver nanoparticles illuminated by a cw laser source, using as a probe a thin film of polymethylmethacrylate (PMMA) doped with the europium(III) thenoyltrifluoroacetonate complex (EuTTA)[48,49].
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