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Coherent phonon excitation in bismuth

2007; Elsevier BV; Volume: 253; Issue: 15 Linguagem: Inglês

10.1016/j.apsusc.2007.01.043

1873-5584

Alexander Q. Wu, Xianfan Xu,

Spectroscopy Techniques in Biomedical and Chemical Research

Ultrafast time-resolved reflectivity of a bismuth thin film evaporated on a silicon substrate is measured to investigate coherent phonons in bismuth. The reflectivity result is analyzed by a linear chirp approximation to obtain the time dependent frequencies of coherent phonons. Not only the optical modes are detected, which are generated by a combination of impulsive stimulated Raman scattering and displacive excitation of coherent phonon, acoustic phonon modes are also observed, which are emitted by the A1g optical phonon.