Strong Optical-Mechanical Coupling in a Vertical GaAs/AlAs Microcavity for Subterahertz Phonons and Near-Infrared Light
Strong Optical-Mechanical Coupling in a Vertical GaAs/AlAs Microcavity for Subterahertz Phonons and Near-Infrared Light
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DOI：
10.1103/physrevlett.110.037403
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发表时间：
2013-01-14
影响因子：
8.6
通讯作者：
Perrin, B.
中科院分区：
文献类型：
--
作者：
Fainstein, A.;Lanzillotti-Kimura, N. D.;Perrin, B.
我们表明，设计用于限制光子的分布式布拉格反射器 GaAs/AlAs 垂直腔自动最佳地限制相同波长的声子，从而大大增强了它们的相互作用。我们通过跟踪皮秒激光实验中弹性应变的时间演化来研究强相干和单色声子的脉冲产生。高 Q 值光学腔模式上的强声子反作用确保了高效的光学检测。据报道，存在较大的光机械因素（类似于太赫兹/纳米范围）。基于这些结构的柱腔预计将显示出皮克有效质量、几乎完美的声音提取以及μW-mW范围内声子受激发射的阈值功率，为通过这些设备中的参数不稳定性演示声子“发射激光”开辟了道路。
We show that distributed Bragg reflector GaAs/AlAs vertical cavities designed to confine photons are automatically optimal to confine phonons of the same wavelength, strongly enhancing their interaction. We study the impulsive generation of intense coherent and monochromatic acoustic phonons by following the time evolution of the elastic strain in picosecond-laser experiments. Efficient optical detection is assured by the strong phonon backaction on the high-Q optical cavity mode. Large optomechanical factors are reported (similar to THz/nm range). Pillar cavities based in these structures are predicted to display picogram effective masses, almost perfect sound extraction, and threshold powers for the stimulated emission of phonons in the range mu W-mW, opening the way for the demonstration of phonon "lasing" by parametric instability in these devices.