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Kinetics of photoinduced changes in Ag nanoparticles deposited on an indium tin oxide surface

Identifieur interne : 009A50 ( Main/Repository ); précédent : 009A49; suivant : 009A51

Kinetics of photoinduced changes in Ag nanoparticles deposited on an indium tin oxide surface

Auteurs : RBID : Pascal:06-0050942

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English descriptors

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 at 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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<div type="abstract" xml:lang="en">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 at 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.</div>
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