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Proceedings Paper

Excitation of large coherent phonon amplitudes in semiconductors and semimetals
Author(s): T. K. Cheng; J. Vidal; H. J. Zeiger; George Dresselhaus; Mildred S. Dresselhaus; Erich P. Ippen
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Paper 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.

Paper Details

Date Published: 17 June 1993
PDF: 1 pages
Proc. SPIE 1861, Ultrafast Pulse Generation and Spectroscopy, (17 June 1993); doi: 10.1117/12.147053
Show Author Affiliations
T. K. Cheng, Massachusetts Institute of Technology (United States)
J. Vidal, Massachusetts Institute of Technology (United States)
H. J. Zeiger, Massachusetts Institute of Technology (United States)
George Dresselhaus, Massachusetts Institute of Technology (United States)
Mildred S. Dresselhaus, Massachusetts Institute of Technology (United States)
Erich P. Ippen, Massachusetts Institute of Technology (United States)


Published in SPIE Proceedings Vol. 1861:
Ultrafast Pulse Generation and Spectroscopy
Timothy R. Gosnell; Antoinette J. Taylor; Keith A. Nelson; Michael C. Downer, Editor(s)

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