Ultrafast impulsive excitation of coherent longitudinal acoustic phonon oscillations in highly photoexcited InSb

Cummings, M. D.; Elezzabi, A. Y.
August 2001
Applied Physics Letters;8/6/2001, Vol. 79 Issue 6
Academic Journal
We report on the direct time-resolved measurement of high-frequency coherent longitudinal acoustic (LA) phonon oscillations in InSb. Two LA-phonon modes are impulsively generated in a highly photoexcited InSb sample and detected through reflectivity modulation with a temporal resolution of 15 fs. The measured frequencies, ν[sub LA](L[sub 1])=4.34 THz and ν[sub LA](X[sub 3])=3.75 THz, are in excellent agreement with those obtained through time-independent techniques. A frequency redshift in the LA(L[sub 1])-phonon frequency, as the energy fluence is increased beyond 10% of the damage threshold fluence, is attributed to an anisotropic impulsive softening of the InSb lattice. © 2001 American Institute of Physics.


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