Excitation of large coherent phonon amplitudes in semiconductors and semimetals

T. K. Cheng; J. Vidal; H. J. Zeiger; George Dresselhaus; Mildred S. Dresselhaus; Erich P. Ippen

doi:10.1117/12.147053

17 June 1993 Excitation of large coherent phonon amplitudes in semiconductors and semimetals

T. K. Cheng, J. Vidal, H. J. Zeiger, George Dresselhaus, Mildred S. Dresselhaus, Erich P. Ippen

Proceedings Volume 1861, Ultrafast Pulse Generation and Spectroscopy; (1993) https://doi.org/10.1117/12.147053
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

Abstract

Recently, we have shown that coherent lattice vibration can be induced and subsequently detected in certain semimetals and semiconductors (e.g. Bi, Sb, Te, Ti₂O₃) using short pulses of optical light. The time-resolved optical pump-probe data show in each case that only totally symmetric lattice modes (i.e. A₁ symmetry) are coherently excited, even though other symmetry modes of comparable Raman cross-section exist. Careful measurement of the coherent photon phase reveals that the excitation mechanism for coherent phonons is related to a pump-induced shift in the ion equilibrium configuration in these materials. Of particular interest in these experiments are the magnitudes of the observed reflectivity modulations. Implications of lattice modulations are discussed as well as the validity of employing the equilibrium calibration in the transient regime.

Citation Download Citation

T. K. Cheng, J. Vidal, H. J. Zeiger, George Dresselhaus, Mildred S. Dresselhaus, and Erich P. Ippen "Excitation of large coherent phonon amplitudes in semiconductors and semimetals", Proc. SPIE 1861, Ultrafast Pulse Generation and Spectroscopy, (17 June 1993); https://doi.org/10.1117/12.147053

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