Applied Physics Letters · 2012 · 35 citations · 21 references
Natural SciencesElectrical EngineeringMaterials ScienceAcousticsPhotonicsSpectroscopyAcoustic Wave PropagationPhysical AcousticsSilicon MaterialsSilicon PhotonicsUltrafast OpticsUltrasonicsAcoustic WavesFemtosecond SpectroscopyMode Identification In Surface WavesSiliconSurface Acoustic WavesSurface WavesTransducersUltrafast Spectroscopy
Various types of surface acoustic waves are generated by femtosecond pulses on bulk silicon with aluminium stripe transducers. Rayleigh and leaky longitudinal surface acoustic wave modes are detected in the time domain for various propagation distances. The modes are identified by measuring on various pitches and comparing the spectra with finite element calculations. The lifetimes of the modes are determined quantitatively by spatially separating pump and probe beam, showing a significant difference in the lifetimes of both modes. We were able to excite and measure Rayleigh modes with frequencies of up to 90 GHz using a 100 nm period grating.
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Surface generation and detection of phonons by picosecond light pulses
C. Thomsen, H. T. Grahn, Humphrey J. Maris et al. · Physical review. B, Condensed matter · 1986 · 1.6K citations
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Gaurav Bahl, John Zehnpfennig, Matthew Tomes et al. · Nature Communications · 2011 · 221 citations · Full text