Fabrication and laser-assisted modification of the Ag particles ensembles supporting quadrupole plasmon oscillations
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A combination of physical vapour deposition, thermal annealing and laser irradiation was used to tailoring of the silver nanoparticles array on a quartz substrate. This method for control of optical properties is exploit 355-nm pulsed laser irradiation. Experimental separation of three main overlapped plasmonic modes, dipoles that correspond to parallel and perpendicular oscillations and quadrupole with maximum wavelength at 355 nm, in extinction spectrum of Ag nanoparticles ensembles was demonstrated. It was shown that the laser post-processing of the nanoparticles array in spectral vicinity of the quadrupole band leads to selective ablation of nanometer particles. This process resulted to close-packing of the nanoparticles ensemble on top of the substrate causing, in turn, formation of ‘hot-spots’ and absorptive bands in the near IR range. Using the laser post-processing as persistent spectral hole burning technique, a dephasing time of quadrupole plasmon resonances was experimentally defined for the first time.
KeywordsSilver nanoparticles Plasmon Laser tailoring Ablation Quadrupole resonance Dephasing time
This work was partially supported by Ministry of Education and Science (Project 2014/190), the Government of Russia (Grant 074-U01), the Russian President’s Grant (MK 228.2017.2), and the RFBR (16-32-60028 mol_a_dk).
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