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Detection of Acoustic Oscillations of Single Gold Nanospheres by Time-Resolved Interferometry
Author(s) -
Meindert A. van Dijk,
Markus Lippitz,
Michel Orrit
Publication year - 2005
Publication title -
physical review letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.688
H-Index - 673
eISSN - 1079-7114
pISSN - 0031-9007
DOI - 10.1103/physrevlett.95.267406
Subject(s) - interferometry , materials science , vibration , spectroscopy , optics , ultrashort pulse , transient (computer programming) , signal (programming language) , ultrafast laser spectroscopy , absorption (acoustics) , molecular physics , physics , acoustics , laser , quantum mechanics , computer science , programming language , operating system
We measure the transient absorption of single gold particles with a common-path interferometer. The prompt electronic part of the signal provides images for diameters as small as 10 nm. Mechanical vibrations of single particles appear on a longer time scale (period of 16 ps for 50 nm diameter). They reveal the full heterogeneity of the ensemble, and the intrinsic damping of the vibration. We also observe a lower-frequency mode involving shear. Ultrafast pump-probe spectroscopy of individual particles opens new insight into mechanical properties of nanometer-sized objects.

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