Vibrational Response of Au-Ag alloy and Porous Au Single nanowires Probed by Ultrafast Pump-Probe Spectroscopy

R Delalande (1) , L Burr (2) , E. Charron (1) , M Jouini (1) , M E Toimil-Molares (2) , L Belliard (1)

1 INSP-E3 - Acoustique pour les nanosciences
2 GSI - Helmholtz Centre for Heavy Ion Research

We report on ultrafast vibrational response of single Au-Ag alloy and Au porous nanowires obtained by the template method. The oscillations of the sample reflectivity are correlated to eigenmodes (EM) confined in the nanowire. Taking advantage of a free standing geometry , we are able to detect few harmonics. Coupling electron microscopy and pump-probe investigations with very high spectral resolution performed on the same wire, we demonstrate that both longitudinal and transverse sound velocity could be obtained for variable Au concentration. Additional quadrupolar mode is also observed and reproduced by finite element simulation. Finally, porous nanowires are investigated.

Mots clés: Au-Ag Alloy nanowire; Nanowires; Vibrations; Pump-probe Spec- troscopy; Porous Au nanowire

Domaines: Vibrations [physics.class-ph]; Mécanique des matériaux [physics.class-ph]; Micro et nanotechnologies/Microélectronique

R Delalande, L Burr, E. Charron, M Jouini, M E Toimil-Molares, et al.. Vibrational Response of Au-Ag alloy and Porous Au Single nanowires Probed by Ultrafast Pump-Probe Spectroscopy. 2019. ⟨hal-02134035v1⟩