NDLI: Vibrational wave packets in metal nanoparticles

Content Provider	IEEE Xplore Digital Library
Author	Gresillon, S. Von Plessen, G. Feldmann, J. Porstendorfer, J. Berg, K.-J. Berg, G.
Copyright Year	2000
Description	Author affiliation: Dept. of Phys., Munchen Univ., Germany (Gresillon, S.; Von Plessen, G.; Feldmann, J.)
Abstract	Due to their small size, metal nanoparticles are expected to show confined vibrational modes with discrete frequencies. In fact, time-resolved optical pump-probe experiments on metal nanoparticles have revealed periodic signal modulations with frequencies consistent with the lowest (n=1) vibrational breathing mode. Higher (n>1) vibrational modes have not been observed, presumably due to their smaller vibration amplitudes. The vibrations in these experiments have been argued to be excited by the thermal expansion of the particle following the lattice heating by the pump laser pulse. We show that vibrational wave packets consisting of up to five vibrational breathing modes (n=1...5) are observed in femtosecond optical pump-probe experiments on spherical silver nanoparticles. The spectral distribution of the wave packets shows that lattice heating is not the only mechanism driving the particle expansion; there is also a considerable electronic contribution.
File Size	95269
File Format	PDF
ISBN	0780363183
DOI	10.1109/IQEC.2000.907854
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-09-10
Publisher Place	France
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Nanoparticles Ultrafast optics Optical pumping Laser excitation Lattices Optical modulation Frequency modulation Thermal expansion Heat pumps Laser modes
Content Type	Text
Resource Type	Article

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