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Optical control and mode selective excitation of coherent phonons in

✍ Scribed by Hiroshi Takahashi; Keiko Kato; Hidetoshi Nakano; Masahiro Kitajima; Kenji Ohmori; Kazutaka G. Nakamura

Publisher
Elsevier Science
Year
2009
Tongue
English
Weight
797 KB
Volume
149
Category
Article
ISSN
0038-1098

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✦ Synopsis

Femtosecond time-resolved reflectivity measurement is performed on YBa 2 Cu 3 O 7-Ξ΄ films. Coherent phonons of both the Ba-O and Cu-O modes are observed at frequencies of 3.4 and 4.3 THz, respectively. Amplitudes of both Ba-O and Cu-O modes are optically manipulated by using a pair of femtosecond pulses, the separation time of which is controlled. Coherent phonons of the Ba-O and Cu-O modes are completely suppressed at the double-pulse separation times of 135.0 and 108.5 fs and those amplitudes are enhanced at 270 and 217 fs, respectively.

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