Publikation: Acoustic Vibrations in Nanosized Gold-Shell Particles
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2007
Autor:innen
Shan, Xinyan
Zhang, X.
Mazurenko, Dmitry A.
Blaaderen, Alfons van
Dijkhuis, Jaap I.
Hudert, Florian
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Journal of physics : Conference Series. 2007, 92. Available under: doi: 10.1088/1742-6596/92/1/012035
Zusammenfassung
We demonstrate and discuss acoustic vibrations in spherical shell particles. The particles consist of 38-nm-thick gold shells, sandwiched between an inner silica core of 456 nm in diameter and an outer silica shell of 10 nm in thickness. Employing standard and asynchronous optical sampling (ASOPS) ultrafast pump-probe experiments, we excite acoustic vibrations of the shells and detect the oscillations via modulations of the optical reflectivity. Two kinds of vibrations were excited and observed. One oscillation with 400 ps period corresponds to the prediction of Lamb theory for breathing modes of free thin gold shells. The other oscillation with 25ps-period corresponds to resonant longitudinal thickness vibrations of the gold shells. At later times, echoes appear corresponding to the travel time through the silica core.
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SHAN, Xinyan, X. ZHANG, Dmitry A. MAZURENKO, Alfons van BLAADEREN, Jaap I. DIJKHUIS, Florian HUDERT, Thomas DEKORSY, 2007. Acoustic Vibrations in Nanosized Gold-Shell Particles. In: Journal of physics : Conference Series. 2007, 92. Available under: doi: 10.1088/1742-6596/92/1/012035BibTex
@article{Shan2007Acous-4690,
year={2007},
doi={10.1088/1742-6596/92/1/012035},
title={Acoustic Vibrations in Nanosized Gold-Shell Particles},
volume={92},
journal={Journal of physics : Conference Series},
author={Shan, Xinyan and Zhang, X. and Mazurenko, Dmitry A. and Blaaderen, Alfons van and Dijkhuis, Jaap I. and Hudert, Florian and Dekorsy, Thomas}
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<dcterms:abstract xml:lang="eng">We demonstrate and discuss acoustic vibrations in spherical shell particles. The particles consist of 38-nm-thick gold shells, sandwiched between an inner silica core of 456 nm in diameter and an outer silica shell of 10 nm in thickness. Employing standard and asynchronous optical sampling (ASOPS) ultrafast pump-probe experiments, we excite acoustic vibrations of the shells and detect the oscillations via modulations of the optical reflectivity. Two kinds of vibrations were excited and observed. One oscillation with 400 ps period corresponds to the prediction of Lamb theory for breathing modes of free thin gold shells. The other oscillation with 25ps-period corresponds to resonant longitudinal thickness vibrations of the gold shells. At later times, echoes appear corresponding to the travel time through the silica core.</dcterms:abstract>
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