摘要
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.
原文 | ???core.languages.en_GB??? |
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文章編號 | 143103 |
期刊 | Applied Physics Letters |
卷 | 89 |
發行號 | 14 |
DOIs | |
出版狀態 | 已出版 - 2006 |