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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Ultrafast Dynamics of Au Nanopyramid Interfaces Prepared by Nanosphere Lithography: Effect of Substrate Chemical Composition

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Author(s):
Ferbonink, Guilherme F. [1] ; Spada, Edna R. [2] ; dos Santos, Diego P. [1] ; Sartorelli, Maria L. [3] ; Nome, Rene A. [1]
Total Authors: 5
Affiliation:
[1] Univ Estadual Campinas, Inst Quim, CP 6154, BR-13083970 Campinas, SP - Brazil
[2] Univ Fed Santa Catarina, Ctr Ciencias Fis & Matemat, Dept Fis, BR-88040900 Florianopolis, SC - Brazil
[3] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13566590 Sao Carlos, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Journal of the Brazilian Chemical Society; v. 27, n. 2, p. 423-433, FEB 2016.
Web of Science Citations: 1
Abstract

This work describes ultrafast spectroscopy studies of Au triangular pyramid particle arrays deposited over glass (termed Au/glass), and 190 nm indium tin oxide (ITO) film (termed Au/ITO/glass) prepared by nanosphere lithography. The linear absorption spectra of Au/glass and Au/ITO/glass exhibit surface plasmon resonances at 800 and 870 nm, respectively, in good agreement with discrete dipole approximation simulations. Ultrafast pump-probe measurements at wavelengths below resonance, at resonance, and above the surface plasmon resonance for each of these two systems are presented. The pump-probe measurements on both systems can be well fit with a model accounting for electron-electron scattering, electron-phonon coupling, and acoustic oscillations on top of cooling of the gold lattice. Numerical simulations employing a two-temperature model are consistent with the single-color pump-probe exponential decays. The wavelength-dependent pump-probe results are interpreted in terms of the complex wavelength-dependent refractive index of gold. We show that this interpretation is consistent with diffractive-optic four-wave mixing spectroscopy measurements of absorptive and dispersive parts of the third-order nonlinear polarization at 800 nm. (AU)

FAPESP's process: 08/10593-0 - Ultrafast spectroscopy measurements of chemical dynamics of liquids
Grantee:René Alfonso Nome Silva
Support Opportunities: Research Grants - Young Investigators Grants