基于半导体声学纳米器件的亚太赫兹单色换能器
Sub-Terahertz Monochromatic Transduction with Semiconductor Acoustic Nanodevices
摘要：
我们展示了半导体超晶格或纳米腔作为亚太赫兹范围内的窄带声换能器。使用皮秒超声波实验中的传输几何与泵和探针入射在厚基板的相对侧，声子产生和检测过程完全解耦。产生与半导体器件和金属上的探测，我们表明，超晶格和纳米腔产生光谱窄波包的相干声子的频率在附近的区域中心和持续时间在纳秒范围内，定性不同的皮秒宽带脉冲通常涉及皮秒声学与金属发电机。产生在金属和探测上的纳米声器件，我们进一步证明，这两个纳米结构的半导体器件可以被用作非常敏感和光谱选择性检测器。
英文摘要：
We demonstrate semiconductor superlattices or nanocavities as narrow band acoustic transducers in the sub-terahertz range. Using picosecond ultrasonics experiments in the transmission geometry with pump and probe incident on opposite sides of the thick substrate, phonon generation and detection processes are fully decoupled. Generating with the semiconductor device and probing on the metal, we show that both superlattices and nanocavities generate spectrally narrow wavepackets of coherent phonons with frequencies in the vicinity of the zone center and time durations in the nanosecond range, qualitatively different from picosecond broadband pulses usually involved in picosecond acoustics with metal generators. Generating in the metal and probing on the nanoacoustic device, we furthermore evidence that both nanostructured semiconductor devices may be used as very sensitive and spectrally selective detectors.
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