Characterizing the nanoacoustic superlattice in a phonon cavity using a piezoelectric single quantum well
Journal
Applied Physics Letters
Journal Volume
89
Journal Issue
14
Date Issued
2006
Author(s)
Abstract
We have experimentally and theoretically investigated, both in the time domain and in the frequency domain, the characteristics of a nanoacoustic mirror, which is a 17-period 8 nm8 nm Al0.7 Ga0.3 N Al0.2 Ga0.8 N superlattice and its first phononic band gap frequency is centered at ∼280 GHz. By using a femtosecond optical pulse to excite and detect the nanoacoustic strain pulses with an In0.2 Ga0.8 N single quantum well, we directly measured the transient dynamics of the acoustic nanowaves inside a phonon cavity composed of the studied nanoacoustic mirror. The phase-resolved reflection transfer function of the phononic band gap superlattice and the properties of the nanophononic cavity have been experimentally obtained and investigated. © 2006 American Institute of Physics.
Type
journal article