Acoustic far-field hypersonic surface wave detection with single plasmonic nanoantennas

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Title: Acoustic far-field hypersonic surface wave detection with single plasmonic nanoantennas
Authors: Berte, R
Della Picca, F
Poblet, M
Li, Y
Cortes, E
Craster, RV
Maier, SA
Bragas, AV
Item Type: Journal Article
Abstract: The optical properties of small metallic particles allow us to bridge the gap between the myriad of subdiffraction local phenomena and macroscopic optical elements. The optomechanical coupling between mechanical vibrations of Au nanoparticles and their optical response due to collective electronic oscillations leads to the emission and the detection of surface acoustic waves (SAWs) by single metallic nanoantennas. We take two Au nanoparticles, one acting as a source and the other as a receptor of SAWs and, even though these antennas are separated by distances orders of magnitude larger than the characteristic subnanometric displacements of vibrations, we probe the frequency content, wave speed, and amplitude decay of SAWs originating from the damping of coherent mechanical modes of the source. Two-color pump-probe experiments and numerical methods reveal the characteristic Rayleigh wave behavior of emitted SAWs, and show that the SAW-induced optical modulation of the receptor antenna allows us to accurately probe the frequency of the source, even when the eigenmodes of source and receptor are detuned.
Issue Date: 21-Dec-2018
Date of Acceptance: 21-Nov-2018
ISSN: 0031-9007
Publisher: American Physical Society
Journal / Book Title: Physical Review Letters
Volume: 121
Issue: 25
Copyright Statement: © 2018 American Physical Society
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/L024926/1
Keywords: Science & Technology
Physical Sciences
Physics, Multidisciplinary
02 Physical Sciences
General Physics
Publication Status: Published
Article Number: ARTN 253902
Online Publication Date: 2018-12-20
Appears in Collections:Physics
Experimental Solid State
Applied Mathematics and Mathematical Physics
Faculty of Natural Sciences

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