Dynamics of coherent acoustic and optical phonon oscillations in nanostructures studied by a femtosecond pump-probe technique Conference Paper uri icon

abstract

  • Coherent phononic oscillations in Bi and Ag nanowires were studied with a femtosecond pump-probe technique. In Bi nanowires laser pulses of 50 fs excited simultaneously acoustic oscillations at a frequency of about 9.5 GHz and optical phonons in the THz range. The transmission of nanowires on a glass substrate and the light scattered from free standing nanowires were measured. In Ag nanowires laser-induced acoustic oscillations at different excitation levels were studied. The observed reduction of the oscillation frequency at higher pump energy was related to a transient softening of the material. This was directly confirmed for optical phonons by experiments with a pre-pump pulse of variable energy, producing different excitation densities. 2010 IOP Publishing Ltd.

published proceedings

  • 15TH INTERNATIONAL CONFERENCE ON PHOTOACOUSTIC AND PHOTOTHERMAL PHENOMENA (ICPPP15)

author list (cited authors)

  • Kolomenskii, A. A., Jerebtsov, S. N., Liu, H., Zhang, H., Ye, Z., Luo, Z., Wu, W., & Schuessler, H. A.

citation count

  • 2

complete list of authors

  • Kolomenskii, Alexandre A||Jerebtsov, Sergey N||Liu, Haidong||Zhang, Hong||Ye, Zuxin||Luo, Zhiping||Wu, Wenhao||Schuessler, Hans A

publication date

  • March 2010