Phonon lifetimes in silicon from 50 GHz to 15 THz - University of ...

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Time domain thermoreflectance and picosecond acoustics • Improved optical design • Normalization by out-of-phase of signal eliminates artifacts, increases dynamic range and improves sensitivity • Exact analytical model for Gaussian beams and arbitrary layered geometries • One-laser/two-color approach tolerates diffuse scattering Clone built at Fraunhofer Institute for Physical Measurement, Jan. 7-8 2008
Time domain thermoreflectance and picosecond acoustics • Optical constants and reflectivity depend on strain and temperature • Strain echoes give acoustic properties p or film thickness • Thermoreflectance gives thermal properties
Page 1 and 2: Phonon lifetimes in silicon from 50
Page 3: Si phonon dispersion high-field car
Page 7 and 8: Broadband acoustic pulses • Fouri
Page 9 and 10: f
Page 11 and 12: Dilute SiGe alloys grown by gas-sou
Page 13 and 14: Pump-probe Raman spectrometer
Page 15 and 16: Time-resolved anti-Stokes intensiti
Page 17: Summary • Lifetime of 100 GHz lon

Phonon lifetimes in silicon from 50 GHz to 15 THz - University of ...

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