Ultrafast acousto-plasmonics in gold nanoparticle superlattices - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2015

Ultrafast acousto-plasmonics in gold nanoparticle superlattices

(1) , (1) , (1) , (1) , (1) , (2) , (2, 3) , (4)
1
2
3
4

Résumé

We report the investigation of the generation and detection of GHz coherent acoustic phonons in plasmonic gold nanoparticle superlattices (NPSs). The experiments have been performed with an optical femtosecond pump-probe scheme across the optical plasmon resonance of the superlattice. Our experiments allow us to estimate first the fundamental mechanical parameters such as the collective elastic response (sound velocity) of the NPS and the nanocontact elastic stiffness. Furthermore, it appears that the light-induced coherent acoustic-phonon pulse has a typical in-depth spatial extension of about 45 nm which is roughly four times the optical skin depth in gold. The modeling of the transient optical reflectivity indicates that the mechanism of phonons generation is achieved through ultrafast heating of the NPS assisted by light excitation of the volume plasmon polariton. Based on these results, we demonstrate that it is possible to map the photon-electron-phonon interaction in subwavelength nanostructures which, in particular, provides insights on the fundamental properties of these nanometamaterials.

Dates et versions

hal-01905603 , version 1 (25-10-2018)

Identifiants

Citer

P. Ruello, A. Ayouch, G. Vaudel, Thomas Pezeril, N. Delorme, et al.. Ultrafast acousto-plasmonics in gold nanoparticle superlattices. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2015, 92 (17), ⟨10.1103/PhysRevB.92.174304⟩. ⟨hal-01905603⟩
56 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook Twitter LinkedIn More