Lanzillotti-Kimura N D, Fainstein A, Jusserand B
Laboratoire de Photonique et de Nanostructures, C.N.R.S., 91460 Marcoussis, France.
Centro Atómico Bariloche & Instituto Balseiro, C.N.E.A., 8400 S.C. de Bariloche, R.N., Argentina.
Ultrasonics. 2015 Feb;56:80-9. doi: 10.1016/j.ultras.2014.05.017. Epub 2014 Jun 6.
Resonators based on acoustic distributed Bragg reflectors (DBRs) were optimized to work in the GHz-THz regime, and grown by molecular beam epitaxy. We show that in structures made of GaAlAs alloys a simultaneous optimal confinement of light in the visible range and phonons in the tens of GHz range can be achieved. We report time resolved differential optical reflectivity experiments performed with fs-ps laser pulses. The experimental results are in excellent agreement with simulations based on standard transfer matrix methods. The resonant behavior of the photoelastic coefficient is discussed. The perfect optic-acoustic mode overlapping, added to a strongly enhanced coupling mechanism, implies that these DBR-based cavities could be the base of highly efficient optomechanical resonators.
基于声学分布式布拉格反射器（DBR）的谐振器经过优化，可在吉赫兹至太赫兹频段工作，并通过分子束外延生长。我们表明，在由GaAlAs合金制成的结构中，可以实现可见光范围内光的同时最佳限制以及几十吉赫兹范围内声子的最佳限制。我们报告了使用飞秒-皮秒激光脉冲进行的时间分辨差分光反射率实验。实验结果与基于标准传输矩阵方法的模拟结果非常吻合。讨论了光弹性系数的共振行为。完美的光声模式重叠，加上强烈增强的耦合机制，意味着这些基于DBR的腔可能是高效光机械谐振器的基础。
