1 research outputs found
Damping of Acoustic Vibrations of Single Gold Nanoparticles Optically Trapped in Water
We combine ultrafast pump–probe spectroscopy with
optical
trapping to study homogeneous damping of the acoustic vibrations of
single gold nanospheres (80 nm diameter) and nanorods (25 nm diameter
by 60 nm length) in water. We find a significant particle-to-particle
variation in damping times. Our results indicate that vibrational
damping occurs not only by dissipation into the liquid, but also by
damping mechanisms intrinsic to the particle. Our experiment opens
the study of mechanisms of intrinsic mechanical dissipation in metals
at frequencies 1–1000 GHz, a range that has been difficult
to access thus far