17 August 2014 Dynamic optical properties of amorphous diamond-like carbon nanocomposite films doped with Cu and Ag nanoparticles
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Abstract
The investigation of relaxation processes in noble metal nanoparticles upon ultrafast excitations by femtosecond laser pulses is useful to understand the origin and the enhancement mechanism of the nonlinear optical properties for metaldielectric nanocomposites. In the current work we analyze diamond like carbon (DLC) film based copper and silver nanocomposites with different metal content synthesized employing unbalanced magnetron sputtering of metal targets with argon ions in acetylene gas atmosphere. Surface morphology and nanoparticle sizes were analyzed employing scanning electron and atomic force microscopy. Optical properties of the nanocomposite films were analyzed employing UV-VIS-NIR spectrometry. Transient absorption measurements were obtained employing Yb:KGW femtosecond laser spectroscopic system (HARPIA, Light Conversion Ltd.). Energy relaxation dynamics in Cu nanoparticles showed some significant differences from Ag nanoparticles. The increase of excitation intensity hasn’t show additional nonlinear effects for the excited state relaxation dynamics for both kinds of samples.
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Tomas Tamulevičius, Domantas Peckus, Asta Tamulevičiene, Andrius Vasiliauskas, Arvydas Čiegis, Šarūnas Meškinis, Sigitas Tamulevičius, "Dynamic optical properties of amorphous diamond-like carbon nanocomposite films doped with Cu and Ag nanoparticles", Proc. SPIE 9163, Plasmonics: Metallic Nanostructures and Their Optical Properties XII, 91632J (17 August 2014); doi: 10.1117/12.2061197; https://doi.org/10.1117/12.2061197
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