Kinetics of photoinduced changes in Ag nanoparticles deposited on an indium tin oxide surface |
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| Authors: | I V Kityk J Ebothé G Chang M Oyama |
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| Institution: | 1. Institute of Physics, J. Dlugosz University of Czestochowa , Al. Armii Krajowej 13/15, 42-217 Czestochowa, Poland i.kityk@ajd.czest.pl;3. Laboratoire de Microscopies and d’Etude de Nanostructures , Université de Reims , Equipe d’Accueil N3799 BP138, 21 rue Clément Ader, 51685 Reims Cedex 02, France;4. International Innovation Center , Kyoto University , Sakyo-ku, Kyoto 606-8501, Japan |
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| Abstract: | An enhancement of the UV-visible optical absorption spectra of Ag nanoparticles (NPs) deposited on indium tin oxide (ITO) surfaces of different resistance by a seed-mediated growth technique is presented. A bicolour coherent beam, obtained from a pulsed Nd:YAG laser providing a 1060-nm fundamental wavelength and a double-frequency one at 530?nm, was used. A significant change in the optical density is observed for Ag NPs on low-resistance ITO surfaces (≈4?Ω/square), while almost nothing occurs with high-resistance (≈50?Ω/square surfaces). The spectral position of the maximal absorption at 440?nm is almost preserved in both cases. This result is explained in terms of a local photoinduced static field and surface-plasmon polaritons interacting with photoexcited phonons. A grating effect, arising from the coherent bicolour light forming a superstructure as for quantum crystals, could be another contribution. |
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