Coherent Phonon Generation and Detection by Picosecond Light Pulses
Abstract
Using the picosecond pump and probe technique we have detected oscillations of photoinduced transmission and reflection in thin films of a-As2Te3 and cis-polyacetylene. These oscillations are due to the generation and propagation of coherent acoustic phonons in the film. We discuss the generation and detection mechanism, and we use this effect to measure the sound velocity in a film of a-SiO2.
- Publication:
-
Physical Review Letters
- Pub Date:
- September 1984
- DOI:
- 10.1103/PhysRevLett.53.989
- Bibcode:
- 1984PhRvL..53..989T
- Keywords:
-
- Acousto-Optics;
- Coherent Acoustic Radiation;
- Electron Phonon Interactions;
- Picosecond Pulses;
- Semiconducting Films;
- Thin Films;
- Acoustic Velocity;
- Optical Pumping;
- Polyacetylene;
- Reflectance;
- Silicon Films;
- Tellurides;
- Transmissivity;
- Solid-State Physics;
- 63.50.+x;
- 78.20.Hp;
- Vibrational states in disordered systems;
- Piezo- elasto- and acoustooptical effects;
- photoacoustic effects