DOI: 10.1063/1.356214. Optical generation of high-frequency acoustic waves in GaAs/Al<i>x</i>Ga1−<i>x</i>As periodic multilayer structures

Optical generation of high-frequency acoustic waves in GaAs/AlxGa1−xAs periodic multilayer structures

10.1063/1.356214

Crossref journal-article

AIP Publishing

Journal of Applied Physics (317)

Abstract

A picosecond study of ultrahigh-frequency acoustic phonons in specifically engineered GaAs/AlxGa1−xAs periodic multilayer structures is presented. The lattice-matched boundary conditions for photothermal acoustic generation and optical properties of these materials make these structures ideal for sound-wave generation in the 100 GHz to THz range. The acoustics are generated using ultrashort-laser-pulse excitation and detected in real time by measuring the strain-induced change in reflectivity with the pump-probe technique. By using 12 nJ, 90 fs pulses from a Ti:sapphire laser source, the generation and detection of ∼50 GHz acoustics in a 6-bilayer, [001]-oriented GaAs/Al0.4Ga0.6As structure, 500 Å thickness per layer, on a GaAs substrate, are successfully demonstrated. The structure was specifically designed to give the maximum sensitivity to the acoustics through étalon-induced modulations in the reflectivity spectrum. With similarly designed multilayer structures, the upper frequency limit can be achieved for the thermoelastic generation of coherent acoustic phonons, that is, ∼300 GHz in GaAs for ∼1 eV above band-gap-energy photons.

Bibliography

BassÃ©ras, P., Gracewski, S. M., Wicks, G. W., & Miller, R. J. D. (1994). Optical generation of high-frequency acoustic waves in GaAs/AlxGa1âxAs periodic multilayer structures. Journal of Applied Physics, 75(6), 2761â2768.

Authors 4

P. Basséras (first)
S. M. Gracewski (additional)
G. W. Wicks (additional)
R. J. D. Miller (additional)

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Dates

Type	When
Created	23 years ago (July 26, 2002, 9:15 a.m.)
Deposited	1 year, 6 months ago (Feb. 2, 2024, 7:56 a.m.)
Indexed	1 year, 6 months ago (Feb. 6, 2024, 7:49 a.m.)
Issued	31 years, 5 months ago (March 15, 1994)
Published	31 years, 5 months ago (March 15, 1994)
Published Print	31 years, 5 months ago (March 15, 1994)

Funders 0

None

BibTeX

@article{Bass_ras_1994, title={Optical generation of high-frequency acoustic waves in GaAs/AlxGa1−xAs periodic multilayer structures}, volume={75}, ISSN={1089-7550}, url={http://dx.doi.org/10.1063/1.356214}, DOI={10.1063/1.356214}, number={6}, journal={Journal of Applied Physics}, publisher={AIP Publishing}, author={Basséras, P. and Gracewski, S. M. and Wicks, G. W. and Miller, R. J. D.}, year={1994}, month=mar, pages={2761–2768} }

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