Optical modulation of low-dimensional semiconductor structures by surface acoustic waves

本计画旨在研究高频声表面波与低维非线性结构间之相互作用。这些高频SAW的波长（相当于载流子扩散长度）和时间周期（相当于光生载流子的典型寿命）有望在量子威尔斯、量子线和量子点中产生新的有趣的物理现象。这些研究将使用具有高横向分辨率（小于1µm）和低于SAW振荡周期（0.5至10 ns）的时间分辨率的光谱技术进行。通过这种方式，我们将能够局部探测SAW与能带结构之间相互作用的动态方面。由SAW诱导的动态调制和由低维半导体中的传输以及光传播特性的控制引入的新功能有望形成新型SAW基声光和电光器件的未来应用的基础。

This project aims at the investigation of the interaction between high-frequency surface acoustic waves (SAWs) and low-dimensional semiconductos structures. The wavelengths (comparable to the carrier diffusion lengths) and time periods (comparable to the typical lifetime of photogenerated carriers) of these high-frequency SAWs are expected to lead to new interesting physical phenomena in quantum wells, quantum wires and quantum dots. These studies will be performed using spectroscopic techniques with high lateral resolution (smaller than 1µm) and with time resolution below the SAW oscillation period (0.5 to 10 ns). In this way, we will be able to locally probe the dynamic aspects of the interaction between SAWs and the band structure. The new functionalities introduced by the SAW-induced dynamic modulation and by the control of the transport as well as of the light propagation properties in low-dimensional semiconductors are expected to form the basis for future applications in novel SAW-based acoustooptical and electrooptical devices.