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Nonlinear ultrasonics in gold-cobalt bilayer structures probed with femtosecond surface plasmons

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Abstract

Giant (1%) picosecond strain pulses are generated in a fs-laser-irradiated cobalt transducer sandwiched between a gold layer and sapphire substrate. Ultrafast plasmonic interferometry reveals nonlinear acoustic propagation effects in the (111) gold film.

© 2013 Optical Society of America

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