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Current issue   Ukr. J. Phys. 2017, Vol. 62, N 1, p.39-45
https://doi.org/10.15407/ujpe62.01.0039    Paper

Bolesta I.M.1, Vakiv M.M.2, Haiduchok V.G.2, Kolych I.I.1, Kushnir A.A.1, Rovetskyy I.M.1, Furgala Yu.M.1

1 Ivan Franko National University of Lviv, Faculty of Electronics and Computer Technologies,
Chair of Radiophysics and Computer Technologies
(107, Gen. Tarnavs’kyi Str., Lviv 79017, Ukraine; e-mail: Alex.Kuschnir@gmail.com)
2 Scientific Production Enterprise “Karat”
(202, Stryis’ka Str., Lviv 79031, Ukraine)

Plasmon Absorption by Silver Nanoparticles on LiNbO3 Surface

Section: Nanosystems
Original Author's Text: Ukrainian

Abstract: The morphology and optical spectra of silver nanoparticles sputtered onto lithium niobate substrates have been studied. Silver films with small mass thicknesses (from 0.5 to 3.0 nm) are found to form oblate spheroidal (disk-like) nanoparticles on the LiNbO3 surface, with a radius of about 7 nm and a height of about 1.2 nm. The corresponding absorption spectra contain a band with a maximum at 520–640 nm, which is associated with the excitation of nanospheroid’s plasmon mode. The location of the plasmon resonance maximum is found to depend on the sign of the lithium niobate surface charge, being equal to 564 nm for the positively charged surface and to 587 nm for the negatively charged one. A mechanism for the explanation of this dependence is proposed.

Key words: surface plasmon resonance, atomic-force-microscopy morphology, silver nanoparticles, absorption spectra.