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We report on gigahertz acoustic phonon waveguiding in free-standing singlecopper nanowires studied by femtosecond transient reflectivity measurements.The results are discussed on the basis of the semianalytical resolution of thePochhammer and Chree equation. The spreading of the generated Gaussian wavepacket of two different modes is derived analytically and compared with theobserved oscillations of the sample reflectivity. These experiments provide aunique way to independently obtain geometrical and material characterization.This direct observation of coherent guided acoustic phonons in a singlenano-object is also the first step toward nanolateral size acoustic transducerand comprehensive studies of the thermal properties of nanowires.

Direct Observation of Propagating Gigahertz Coherent Guided Acoustic Phonons in Free Standing Single Copper Nanowires