Coherent generation of 100 GHz acoustic phonons by dynamic screening of piezoelectric fields in AlGaN/GaN multilayers
Abstract
Ultrashort pulse laser techniques have been used to observe and characterize the generation of coherent phonons by rapid screening of strain-induced piezoelectric polarization fields in AlGaN/GaN multilayers. The results are compared with those where coherent phonons are launched by optical techniques without the carrier injections process to show consistency with the anticipated longitudinal phonon dispersion in the nitride semiconductor samples.
- Publication:
-
Applied Physics Letters
- Pub Date:
- October 2002
- DOI:
- 10.1063/1.1512821
- Bibcode:
- 2002ApPhL..81.2791M
- Keywords:
-
- 63.22.+m;
- 77.65.Ly;
- 78.20.Hp;
- 63.20.Dj;
- 77.84.Bw;
- 78.67.-n;
- 73.21.Ac;
- 43.35.Ud;
- Phonons or vibrational states in low-dimensional structures and nanoscale materials;
- Strain-induced piezoelectric fields;
- Piezo- elasto- and acoustooptical effects;
- photoacoustic effects;
- Phonon states and bands normal modes and phonon dispersion;
- Elements oxides nitrides borides carbides chalcogenides etc.;
- Optical properties of low-dimensional mesoscopic and nanoscale materials and structures;
- Multilayers;
- Thermoacoustics high temperature acoustics photoacoustic effect