期刊
APPLIED PHYSICS LETTERS
卷 94, 期 10, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3097244
关键词
aluminium compounds; gallium compounds; high-speed optical techniques; III-V semiconductors; phonons; semiconductor superlattices
资金
- program Alssn
- European Union Programme of High Level Scholarships for Latin America [E05D051993AR]
We present a device for the optimization of the folded acoustic phonon signal in femtosecond pump-probe experiments through the spatial decoupling of the generation and detection processes in two different GaAs/AlAs superlattices separated by a thick GaAs layer. A thickness gradient in one of them allows a fine tuning of the generation and detection spectral responses. In the optimal overlap condition, a clear enhancement of the signal is observed at a time delay that matches the travel time of acoustic phonons through the intermediate layer. This nanostructure provides a sensitive tool for studying terahertz phonon propagation over long distances.
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