Akimov A V, Scherbakov A V, Yakovlev D R, Bayer M
School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK; Ioffe Physical-Technical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia.
Ioffe Physical-Technical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia.
Ultrasonics. 2015 Feb;56:122-8. doi: 10.1016/j.ultras.2014.02.008. Epub 2014 Feb 28.
We overview the results of three recently performed experiments, where the picosecond acoustic technique was applied to semiconductor devices with quantum wells or quantum dots embedded in an optical microcavity. In these experiments, high amplitude picosecond strain pulses are injected into such a device and the resulting changes in the response of the optical resonance are monitored. First, in quantum well devices we observe the generation of THz sidebands in optical reflectivity near the polariton resonance. Second, for certain conditions we detect the destruction and recurrence of excitons by acoustic shock waves on picosecond time scales. Third, in a vertical cavity surface emitting laser with a quantum dot layer the injection of the picosecond strain pulses induces the giant increase of the laser output. All these effects are governed by nonadiabatic processes in the interaction between a strain pulse and the electronic quantum confined states. Their observation became possible due to the possibility of generating very short strain pulses with sufficiently high amplitude.
我们概述了最近进行的三个实验的结果，其中皮秒声学技术应用于嵌入光学微腔中的具有量子阱或量子点的半导体器件。在这些实验中，高振幅皮秒应变脉冲被注入到这样的器件中，并监测光学共振响应中产生的变化。首先，在量子阱器件中，我们观察到在极化激元共振附近的光学反射率中产生太赫兹边带。其次，在某些条件下，我们在皮秒时间尺度上检测到声冲击波对激子的破坏和重现。第三，在具有量子点层的垂直腔面发射激光器中，皮秒应变脉冲的注入导致激光输出大幅增加。所有这些效应都由应变脉冲与电子量子受限态之间相互作用中的非绝热过程所支配。由于能够产生具有足够高振幅的非常短的应变脉冲，这些效应的观察成为可能。
