Subharmonic Resonant Optical Excitation of Confined Acoustic Modes in a Free-Standing Semiconductor Membrane at GHz Frequencies with a High-Repetition-Rate Femtosecond Laser Auteur(s): Bruchhausen A., Gebs R., Hudert F., Issenmann D., Klatt G., Bartels A., Schecker O., Waitz R., Erbe A., Scheer E., Huntzinger J.-R., Mlayah Adnen, Dekorsy T. (Article) Publié: Physical Review Letters, vol. 106 p.077401 (2011) Texte intégral en Openaccess : Ref HAL: hal-00670043_v1 DOI: 10.1103/PhysRevLett.106.077401 WoS: 000287392300010 Exporter : BibTex | endNote 58 Citations Résumé: We propose subharmonic resonant optical excitation with femtosecond lasers as a new method for the characterization of phononic and nanomechanical systems in the gigahertz to terahertz frequency range. This method is applied for the investigation of confined acoustic modes in a free-standing semiconductor membrane. By tuning the repetition rate of a femtosecond laser through a subharmonic of a mechanical resonance we amplify the mechanical amplitude, directly measure the linewidth with megahertz resolution, infer the lifetime of the coherently excited vibrational states, accurately determine the system's quality factor, and determine the amplitude of the mechanical motion with femtometer resolution. |