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28 Oct 2002

Volume 81, Issue 18, pp. 3311-3500

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Generation and propagation of monochromatic acoustic phonons in gallium arsenide

A. J. Kent, N. M. Stanton, L. J. Challis, and M. Henini

Appl. Phys. Lett. 81, 3497 (2002); http://dx.doi.org/10.1063/1.1515118 (3 pages) | Cited 17 times

Online Publication Date: 22 October 2002

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We have generated coherent zone-folded longitudinal acoustic (LA) phonons by femtosecond pulse-laser excitation of a gallium arsenide/aluminum arsenide superlattice. Using the filter effect due to frequency-dependent scattering in the gallium arsenide substrate, we have determined the frequency spectrum of the LA phonons that leak out of the superlattice and propagate to a bolometer on the opposite face of the gallium arsenide substrate. We show that the phonon spectrum has a strong monochromatic component centered on ν = sLA/dSL, where dSL is the superlattice period and sLA is the phonon speed. We propose that such phonons may be used for phonon spectroscopy and in a range of “phonon optics” applications. © 2002 American Institute of Physics.
Show PACS
63.22.-m Phonons or vibrational states in low-dimensional structures and nanoscale materials
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