Phonon physics : acoustics at terahertz frequencies

Abstract

It is the natural aim of phonon physics at terahertz frequencies to extend the possible range of phonon spectroscopic investigations to the upper limit of 10THz. There are some approaches in this direction. Especially semiconductor physics and microelectronics see the importance of phonon aspects. With respect to the transitions of photons in high energetic phonons in semiconductors as Ga/As very interesting results have been obtained.