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太赫兹频率的相干声子在纳米尺度器件的探测和操控领域具有重要的应用价值。半导体超晶格声子激光器是实现太赫兹频率相干声子源稳定输出的重要途径。本文首先回顾了GHz到THz频率范围声学放大的多种方法,然后详细阐述了超晶格声子放大、超晶格声学布拉格镜的工作原理与设计方法以及声子激光器的阈值条件,同时总结了电抽运和光抽运结构器件的研究现状,最后简要讨论了亚太赫兹声子激光器在声-电子领域的应用。分析表明,这种能够产生强相干太赫兹声子的半导体超晶格声子激光器在纳米尺度器件的探测与成像等方面具有广阔的发展前景。
Terahertz-band coherent phonons have important applications in the field of detection and manipulation of nanoscale devices. The semiconductor superlattice phonon laser is an important way to realize stable output of the terahertz frequency coherent phonon source. This paper first reviews several methods of acoustic amplification from GHz to THz frequency range, and then elaborates the working principle and design method of superlattice phonon amplification, superlattice acoustic Bragg mirror and threshold conditions of phonon laser, Electric pump and optical pumping structure of the device research status, and finally briefly discussed the Asia Pacific Hertz phonon laser in acousto-electronic applications. The analysis shows that this kind of semiconductor superlattice phonon laser capable of producing strong coherent terahertz phonons has broad prospects for the exploration and imaging of nanoscale devices.